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

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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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