问题

Clifford Shaw, an American sociologist, reached the conclusion that the industrial urban e

Clifford Shaw, an American sociologist, reached the conclusion that the industrial urban environment______ the moral fiber(品质, 意志)and traditions of immigrants who settled in the great cities.

A．shortened

B．lessened

C．lightened

D．weakened

请帮忙给出正确答案和分析，谢谢！

参考答案

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