单项选择题

______ Jack not busy, he would help us.

A.If
B.Were
C.Had
D.Did
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单项选择题
New machinery ______ arriving tomorrow.
A.will be
B.is
C.are
D.shall be
单项选择题
I can’t afford as ______ car as this one.
A.expensive a
B.an expensive
C.a more expensive
D.a most expensive
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