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问题: The mistake was ___ by the carelessness of the ass

The mistake was ___ by the carelessness of the assistant.
选项:
a、due
b、caused
c、because
d、owe

解答:

选B.
由于due to、owe to、because of三个词组都不用by.
caused“造成”“错误是由助手的粗心造成的”