While the Sales Department has been______ in marketing our new range, we have be

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问题 While the Sales Department has been______ in marketing our new range, we have been let down by our quality assurance section.

选项 A、accomplishing
B、mindful
C、successful
D、climbing

答案 C

解析 while既可以表示“…的时候”，也可以表示对照意义的“而，却”。本题中while表示“而，却”。答案是(C)successful，与后面的let down形成对照意义。(A)accomplishing是及物动词，后面需要接宾语。

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