单项选择题

I borrow the book Sherlock Holmes from the library last week, _________ my classmates recommended to me.

A．who
B．which
C．when
D．Where
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单项选择题
Jane is in a hurry because the train to the airport leaves _________ half an hour.
A．by
B．in
C．for
D．until
单项选择题
_________ carefully if any change occurs when doing experiments in the lab.
A．Observe
B．To observe
C．Observed
D．Observing
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