单项选择题

A ______ is a formal or official agreement made between persons, groups, institutions or states.

A．contract
B．contact
C．contrast
D．contest
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单项选择题
There is no doubt ______ he'll come.
A．that
B．whether
C．of
D．about
单项选择题
Scarely had I reached there ______ it began to rain.
A．than
B．that
C．when
D．while
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