【題目】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

【答案】B

【解析】

句意：孩子們，一次拿一本書。請在閱覽室里保持安靜�？疾榻樵~短語辨析題。in time及時；B. at a time依次，逐個；C. on time及時，正點；D. at times有時，間或。根據(jù)句意語境，可知at a time符合語境，故選B。

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