The chief concern ___ foggy winter is that the lower temperaters and the absence of sunlight would severelydisrupt food production. A.on B.over C.of D.for

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题目内容（河南城建学院-大学英语2）

The chief concern ___ foggy winter is that the lower temperaters and the absence of sunlight would severelydisrupt food production.

A.on
B.over
C.of
D.for

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四川大学民事诉讼法