Ms. Andrew had difficulty understanding _______the customer was trying to commun

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问题 Ms. Andrew had difficulty understanding _______the customer was trying to communicate to him.

选项 A、how
B、what
C、whether
D、why

答案 B

解析前面的understand是及物动词，空格后是名词性从句。所有的选项都可以引导名词性从句，但除了B选项之外，其他的都是在完整句子中使用的。communicate做及物动词使用时，后面应接宾语，所以本句中的名词性从句是不完整的。

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