We must begin testing the instrument,no matter ______ difficult it is.

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问题 We must begin testing the instrument,no matter ______ difficult it is.

选项 A、what
B、how
C、when
D、where

答案B

解析 此题考查句法。读懂全句,注意填充词与difficult的关系。确定difficult为形容词,修饰它的应为副词。后看四个选项,只有how为副词,其余均为从属连词,故选B为答案。
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本试题收录于: 英语题库成考专升本分类
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