题目内容
Sometimes I work ________ the day and sometimes _________ night.
A.on, at | B.at, on | C.at, in | D.in, at |
D
在白天用介词during或in,而在夜晚用介词at,故选答案为D
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题目内容
A.on, at | B.at, on | C.at, in | D.in, at |