题目内容
19.---Who's _____duty today?---Jack is.( )
A. | by | B. | on | C. | at |
分析 --今天谁值日?
--Jack.
解答 答案:B
解析:on duty"值日"为固定短语,故本题答案为B选项.
点评 本题考查介词的辨析,做此类题目时一定要清楚各个选项的含义及用法,再结合句意及其它要求选出最终答案.
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