问题

He made another wonderful discovery, _______ of great importance to science.

A:which I think is
B:which I think it
C:which I think it is
D:I think which is

正确答案是：

同类题型

bought three DVD copies of the film Avatar and now _ is left. Somebody just borrows something and never returns.

Had the boy worked harder, he ______ the exam.

___________ — S-O-C-C-E-R.

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