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
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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
单项选择题
---Hi, let’s go skating.--- Sorry, I’m busy right now. I _________ in an application form for a new job.
A．fill
B．have filled
C．am filling
D．will fill
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