中国电子科技集团 熊猫:关于英语

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if 与 whether 的区别.什么时候只能用哪个?

1.The man __a friend says one of these things gets to worry about the matter.
A.who B.whom C.to whom D.whose 为什么?
2.-Don't look down upon Bob.He has his own advantages.
-yes.____others are weak,he is strong.
A.if B.when C.though D.where 为什么?
3.It won't be ____you____your repair work.
A.long before;complete
B.long before; will complete
C.beforelong; complete 为什么?
4.-Do you know ____Mr.Smith's address is?
-He might live at No.1 or No.2 of Heping Road,but I'm not sure of ____.
A.what which B.where which C.where what D.what where 为什么?
We should plant more trees ____pollution is serious.
A.where B.the place which
C.in which D.the place where 为什么?

一般来说用whether没错
1.C a friend says one of these things to the man
the man是宾语用whom作为连接词,to是介词可提前
2.D A,B,C均不通
3.A 如果主句是将来时,从句用一般现在时代替将来时
4.A what引导宾语从句 Mr. Smith's address is sth.
有范围用which
问题补充 A 地点状语从句,改为定语从句:
We should plant more trees in the place (where pollution is).