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
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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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