We must begin testing the instrument no matter _____ difficu

题目内容(请给出正确答案)
单选题
We must begin testing the instrument no matter _____ difficult it is.
A

what

B

when

C

how

D

however

参考答案和解析
正确答案: A
解析:
句意:不论有多难,我们必须开始测验仪器。no matter how difficult相当于however it is difficult。
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