单项选择题

Why hasn't he come ______on time, we will have to put off the trip.

A．If he doesn't come
B．If he won't come
C．If he shouldn't come
D．If he hadn't come
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单项选择题
When we ______ the museum is not decided.
A．visited
B．visit
C．will visit
D．visiting
单项选择题
She sat there with nothing ______ except play with her cat.
A．to do
B．doing
C．done
D．to be done
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