问题
选择题
Not all insects are pests; in fact, a great many of them are ____ to man.[ ]
A. benefit
B.beneficent
C. beneficial
D.beneficially
答案
答案：C
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Not all insects are pests; in fact, a great many of them are ____ to man.[ ]
A. benefit
B.beneficent
C. beneficial
D.beneficially
答案：C