单项选择题

As preparations were not completed in time，the conference had to be ______ till the next Tuesday．

A．put away
B．cancelled
C．put aside
D．postponed
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单项选择题
Yon ought to take every ______ of improving your English．
A．time
B．Chance
C．thing
D．case
单项选择题
This rough life ______ to injure his health．
A．expected
B．promised
C．enforced
D．threatened
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