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  3. We must begin testing this instrument, no matter ________ difficult it is.

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 “no matter…”从句中，修饰形容词difficult的应是副词how。不能选A，however相当于no matter how。句意：我们必须开始测试这台仪器，不管这有多难。
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