单项选择题

Greater efforts to increase agricultural production must be made if food shortage ______ avoided.

A．is to be
B．can be
C．will be
D．has been

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单项选择题

I worked so late in the office last night that I hardly had time ______ the last bus.

A．to have caught
B．to catch
C．catching
D．having caught

单项选择题

There are over 100 night schools in the city, making it possible for a professional to be reeducated no matter ______ he does.

A．how
B．where
C．what
D．when

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