--Is Mrs White in the office? --Yes, ______ she is on duty, she must be there.

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问题 --Is Mrs White in the office? --Yes, ______ she is on duty, she must be there.

选项 A、since
B、until
C、for
D、if

答案A

解析 since表示“因为……,既然……”,比because意味稍弱,表示的原因大多是彼此已经知道的。since所引导的从句多出现在句首。
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