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问题: 英语

This is () Lucy was absent yesterday.
A the cause
B the reason for
C why
答案是C,请解释

解答:

This is/That's why后面加从句表原因,是最常见的表达法。
the cause后面不能直接加从句,得有连接词that;
the reason for后面也不能加句子,只能加名词或名词性的短语。