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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He ______ a cold last week.
A．had caught
B．caught
C．has caught
D．has had
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Tell me since when he ______ in your school.
A．taught
B．has taught
C．teaches
D．had taught
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