______ substantial layoffs, costs were reduced.

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问题 ______ substantial layoffs, costs were reduced.

选项 A、When
B、Because of
C、Although
D、Since

答案B

解析 Because of indicates a cause-and- effect relationship and can be followed by a noun phrase. Choice (A) must be followed by a subject and verb. Choice (C) indicates an unexpected result and must be followed by a subject and verb. Choice (D) must be followed by a subject and verb when indicating a cause-and-effect relationship.  
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