单项选择题

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

A. for
B. why
C. since
D. whoever
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单项选择题
Our multi-skilled CEO has distinguished ______ yet again by winning the coveted Brookings Award for innovation in business.
A. he
B. his
C. him
D. himself
单项选择题
The latest ______ to emerge from our production lines is considered by many to lead the field in the area of mobile communications.
A. product
B. produce
C. producing
D. productivity
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