单项选择题

The Security Department has warned that any ______ use of the car park on weekends will result in the vehicle being towed.

A. unauthorize
B. unauthorizes
C. unauthorizing
D. unauthorized
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Any staff members traveling overseas on company business will be ______ for exceeding their expense allowances.
A. billed
B. arranged
C. replaced
D. produced
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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