单项选择题

Having been ill for a few years, she had a particularly fragile ____________.

A．constitution
B．institution
C．construction
D．instruction
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单项选择题
The task will be finished ____________ if everything goes on as we have planned.
A．ahead of schedule
B．on schedule
C．behind schedule
D．in schedule
单项选择题
It's quite ____________ me why she married such a heavy smoker.
A．between
B．beyond
C．beneath
D．before
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