We must begin testing this instrument, no matter______difficult it is.

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问题 We must begin testing this instrument, no matter______difficult it is.

选项 A、however
B、how
C、whatever
D、what

答案B

解析 本句的意思是:无论有多么困难,我们都必须要检测这台仪器。让步状语从句题:在no matter...从句中,修饰形容词difficult的应是起副词作用的how,构成no matter how,相当于however。
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