单项选择题

______ you are free tonight, why not come over and play with us.

A) For
B) Because of
C) Since
D) Even if
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单项选择题
Jill was not in her classroom yesterday afternoon. She ______ ill.
A) should have been
B) should be
C) must have been
D) must be
单项选择题
I know Mrs. Casey; we ______ to each other at a party.
A) are introduced
B) are being introduced
C) were introduced
D) were being introduced
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