单项选择题

Plastic bags are useful for holding many kinds of food,（）their cleanness, toughness and low cost.

A. by virtue of
B. in addition to
C. for the sake of
D. as opposed to

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单项选择题
Public works projects have not significantly ______ the unemployment situation.
A. facilitated
B. mollified
C. softened
D. alleviated
单项选择题
There was to be more use, where necessary and if carefully monitored, of （）capital re- sources drawn from international institutions such as the World Bank.

A. complementary
B. compulsory
C. supplementary
D. compensatory
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