The reason ___he gave for being late was ____he forgot to use the alarm clockA which ,because B why ,because C which ,thatD that because ,为什么
问题描述：
The reason ___he gave for being late was ____he forgot to use the alarm clock
A which ,because
B why ,because
C which ,that
D that because
,为什么
答
句子主干是: The reason was that he forgot to use the alarm clock.就是说，在系动词was之后的是个表语从句，连接词that只起到了连接的作用，没有词义，不充当其他语法成分；而because是有词义的，它引导表语从句时，主语只能是it；故排除A、B和D.
答
C
答
which引导定语从句,在定语从句中代替先行词reason在定语从句中作gave的宾语；that 在此引导表语从句,在表语从句不充当成份,也没有实际意,且一般不可省略.
句意：他给的迟到的理由是他忘了定闹钟.
答
定语从句gave 缺宾语，所以前一空选which 或者that ， 这样排除A,B ， 后面的表语从句陈述的是reason的内容。用that
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