单项选择题

Mary ______ in bed all day because she had a fever.

A．lay
B．has laid
C．has lain
D．laid
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单项选择题
I ______ my work by this time yesterday evening.
A．did
B．would do
C．had done
D．was doing
单项选择题
______ he come, what ______ you say to him
A．If, will
B．Should, would
C．When, would
D．Would, do
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