单项选择题

21（）

A．was
B．finishes
C．brings
D．is missing

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单项选择题
Little ______ that their plan has been discovered.
A．they suspect
B．do they suspect
C．they suspected
D．did they suspect
单项选择题
We usually have a lot of staff illness ______ the winter period.
A．for
B．since
C．over
D．while
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