单选题_____AwhichBwhyCthatDwhether
单选题
_____
A
which
B
why
C
that
D
whether
参考解析
解析：
名词reason作主语时，其后的表语从句要用that引导，不能用because或why引导。故本题选C。
名词reason作主语时，其后的表语从句要用that引导，不能用because或why引导。故本题选C。
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