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
He ______back and he left a note for you.
A．came
B．has been
C．will be
D．is being
单项选择题
Tell me since when he ______ in your school.
A．taught
B．has taught
C．teaches
D．had taught
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