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

Help me! Even professional marketers are never sure ________ some new products are runaway successes while others fail miserably. A. for B. why C. since D. whoever
7 years ago
Asked 7 years ago
Jade

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B. why
Answered 7 years ago
bogus English teacher

why
Answered 7 years ago
Sam

B. why Because there's a contrast in the sentence.
Answered 7 years ago
Luka Ivezic - Lukaznachi

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