—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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