is hard is to do good all one’s life and never do anything bad.
A．ThatB．WhatC．AllD．Which
B

試題分析：句意：難做的事情是人的一生都做好事，從不做壞事。第二個(gè)is前面的是主語從句主語從句中缺少主語，用what連接，that連接主語從句的時(shí)候，不做成分，all后面加that就對了，which引導(dǎo)定語從句，所以選B。
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