The reason is _____ he is unable to operate the machine.A、becauseB、whyC、thatD

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问题 The reason is _____ he is unable to operate the machine.

选项 A、because
B、why
C、that
D、whether

答案 C

解析

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_____thatherefusedtohelpus,thereisnoreasonwhyweshouldnowhelphim.