Theengineerexaminedthemachinefo

发布时间：2020-07-28 02:51:11

The engineer examined the machine for over two hours and finally ________ what was wrong with it.A.foundB.found outC.inventedD.founded

网友回答

B解析依据语境可知，该工程师通过检查，花了两个多小时的时间最终弄明白了机器出故障的原因，故须用find out。
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