Female horseflies transmit (a few) diseases, (but) their main (significance)as pests is (in sting) of their bite.

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问题 Female horseflies transmit (a few) diseases, (but) their main (significance)as pests is (in sting) of their bite.

选项 A、a few
B、but
C、significance
D、in sting

答案D

解析
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