完成率计算公式:请帮忙看看这几个题该怎么做?

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一个亲戚的孩子要去新加坡。这之前要有个考试,这是去年的考试题,我看着很难,请高手指教一下,谢谢~~
1.Van Gogh's Sunflowers___39.9 million dollars, three times the previous record.
A. once sold for B. for sale once C.selling for once D.for conce sold

2.It is gravity___objects toward the earth.
A.pulling B. that pulls C.to pull D.what pulls

3.Most accidents in the home can be prevented by ___ elimination of hazards.
A. that B.that the C.there is a D.the

4.People ususlly get a sufficient amount of the calcium their bodise___ from the food they consume.
A. need B.needs C.needing D.to need

5.A partenership is an association of two or more individuals who ____ together to develope a business.
A. worked B.they work C.work D.working
请问第1题为什么选A啊,我选的是D!!

1.Van Gogh's Sunflowers___39.9 million dollars, three times the previous record.
A. once sold for B. for sale once C.selling for once D.for conce sold

A 此处sold为不及物动词,“出售”之意。全句大意是:梵高的《向日葵》曾以三千九百九十万的价格出售,这是从前的记录的三倍。

2.It is gravity___objects toward the earth.
A.pulling B. that pulls C.to pull D.what pulls

B.It is ... that...是强调句型,被强调的部分放在that的前面。全句大意是:就是地球引力将物体拉向了地球。

3.Most accidents in the home can be prevented by ___ elimination of hazards.
A. that B.that the C.there is a D.the

D. 这个是显而易见的。

4.People usually get a sufficient amount of the calcium their bodies___ from the food they consume.
A. need B.needs C.needing D.to need

A.their bodies need是定语从句,修饰先行词calcium。从句主语是bodies为复数,所以用need。全句大意是:人们通常是从消耗的食物中获取他们身体所需的足够的钙的。

5.A partnership is an association of two or more individuals who ____ together to develop a business.
A. worked B.they work C.work D.working

C. who work to develop a business 是定语从句,修饰先行词individuals,而先行词在从句中作主语,为复数形式,所以谓语动词用work。

1.A
2.B
3.D
4.A
5.c

a
b
d
a
c
我就在新加坡=)

仅供参考:

1.A 2.B 3.D 4.A 5.C

1.A. once 用在系动词is等后,行为动词sold前。sell for 指卖了多少钱。
2。B。这是一句强调句,要用it is...that/who(用于指人)/which(较少用) 这一固定句型。
3。D。by是介词,后面跟名词,代词,动名词或宾语从句
4。A。这是一句定语从句,calcium是先行词,省略连接词that(因为在从句中作宾语),从句部分调整语序后是这样的their bodies___ (calcium)空格中自然要填need
5。c。这题和第四题一样是定语从句,individuals 是先行词,后面是从句部分。如果不太明白定语从句,可以翻一下语法书。