Is Mr Green in the office?—Is Mr Green in the office?—Yes.___he is in charge of the office,he must be there.A.since B.for请问选哪个,为什么,

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Is Mr Green in the office?—Is Mr Green in the office?—Yes.___he is in charge of the office,he must be there.A.since B.for请问选哪个,为什么,
Is Mr Green in the office?
—Is Mr Green in the office?
—Yes.___he is in charge of the office,he must be there.
A.since B.for
请问选哪个,为什么,

Is Mr Green in the office?—Is Mr Green in the office?—Yes.___he is in charge of the office,he must be there.A.since B.for请问选哪个,为什么,
选A
两个中只有since才能带一个原因状语从句

A自从的意思

A