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问题

It never _____ humans until the mid­1990s that some animals can be cloned

A:occur
B:is occurred
C:occurred to
D:occurred
正确答案是:
同类题型

He didn’t take the airplane from Malaysia to Beijing, otherwise he _______ his life.

Two-thirds of the land ________ covered with green grass and the rest _______ covered with pine trees.

By talking with them,I get to know ________ Russian people see their country and the US.

I wish I __________ at my sister’s wedding, but I was on a business trip in New York last weekend.

I’d like to open a current account.—- _________

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