Question

【题目】Take one book , boys and girls. And keep quiet in the reading room please.

A. in time B. at a time C. on time D. at times

Answer 1

【答案】B

【解析】

句意：孩子们，一次拿一本书。请在阅览室里保持安静。考查介词短语辨析题。in time及时；B. at a time依次，逐个；C. on time及时，正点；D. at times有时，间或。根据句意语境，可知at a time符合语境，故选B。