题目内容

I started work a_ d_and returned only at nightfall.

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S_ c_was an important means of man-carrying transportation in ancient China.

It's late. Who will e_________ this young lady home?

At Christmas it was c_________ for the children to perform bits of poetry.

肺活量2次测试的时间间隔不超过秒

A. 13
B. 14
C. 15
D. 16