Even professional marketers are never sure ______some new products are runaway successes while others fail miserably.

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问题 Even professional marketers are never sure ______some new products are runaway successes while others fail miserably.

选项 A、for
B、why
C、since
D、whoever

答案B

解析 sure的用法为be sure of／about sth．或be sure+从句。答案是(B)why。

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