问题

In September 2008,China’s key milestone in space travel _____when Zhai Zhigang conducted the first space walk.

A:reached
B:was reached
C:has reached
D:had been reached

正确答案是：

同类题型

How did you do on the test?一Not so well. I ________ much better but I misread the directions for Part One.

____ several times, the young scientist still kept ondoing his experiments.

Why are you laughing –Oh, I’ve just read interesting story.

Surely it doesn’t matter where the studentassociations get their money from; what _______ is what they do with it

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