单项选择题

You must exert yourself ______ anything.

A．achieving
B．to achieve
C．to achieving
D．achieve
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单项选择题
Theoretically speaking, there are dangers ______ in almost every sport.
A．adherent
B．coherent
C．cohesive
D．inherent
单项选择题
Time was ______ you could buy a loaf of bread for sixpence.
A．which
B．that
C．what
D．when
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