Marketing specialists are really not sure______ changes in the climate will affect sales of recreational vehicles.

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问题 Marketing specialists are really not sure______ changes in the climate will affect sales of recreational vehicles.

选项 A、where
B、how
C、what
D、who

答案B

解析 sure的用法有be sure of／about sth．或be sure+从句。答案是(B)how.本题与第106题题型相同。

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