单项选择题

His experiences show that if someone can do their jobs really well, then the question of ______ they are male or female is not important.

A.if
B.that
C.whether
D.which
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______ Jack not busy, he would help us.
A.If
B.Were
C.Had
D.Did
单项选择题
New machinery ______ arriving tomorrow.
A.will be
B.is
C.are
D.shall be
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