问题
选择题
--- Is Mr. Smith in the office?
--- Yes，_____ he is in charge of the office，he must be there.
A．however
B．since
C．whether
D．for
答案
答案：B
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--- Is Mr. Smith in the office?
--- Yes，_____ he is in charge of the office，he must be there.
A．however
B．since
C．whether
D．for
答案：B