单项选择题

Last week I wrote to the hotel to book a room, but they （） yet.

A．didn't answer
B．wasn't answering
C．hadn't answered
D．haven't answered

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单项选择题

You should carefully think over _____ the manager said at the meeting.

A．that
B．which
C．what
D．whose

单项选择题

Having been told that her son died in the accident, the old woman appeared very calm, as if nothing（）

A．happened
B．were happened
C．was happened
D．had happened

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