问题描述：
Little___done to prevent the air from being polluted.
Much___done to fight against pollution.
A.has been;have been
B.have;has
C.has been;has been
D.have been;have been
Five hundred dollars___more than he can afford.
A.is B.are
Much___done to fight against pollution.
A.has been;have been
B.have;has
C.has been;has been
D.have been;have been
Five hundred dollars___more than he can afford.
A.is B.are
问题解答：
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