石林斗牛擎天柱被打死:i don't think ( ) possible to master a foreigtn language without much memory work.

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i don't think ( ) possible to master a foreigtn language without much memory work.
括号中应该填什么
A : this B: that C:its D: it

1990年全国高考试题
I don’t think___it___possible to master a foreign language without much memory work.
A.this B.that C.its D.it
答案：D

这是固定句式 think it+adj.+to do sth.

it作形式主语,真正的主语是 to finish the work in time

选C IT是形式主语代替的是后面的不定试结构

D it
若选that，则其后应跟从句，即that it's...

应该是it

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