单项选择题

They () visit us a lot but they don't now.

A.must
B.need
C.can
D.used to

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单项选择题
Do ()you are told.

A.after
B.as if
C.where
D.as
单项选择题
The cost of my house is higher than () of his.

A.any
B.cost
C.that
D.it
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