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Thereason___hemissedschoolthismorningwas___hehadtolookafterhissickmother.AwhythatBbecausewhyCthatbecauseDwhichthat说明理由
题目内容：
The reason ___ he missed school this morning was ___ he had to look after his sick mother.
A why that
B because why
C that because
D which that
说明理由优质解答
A
The reason why.is that.
之所以.是因为.
A why that
B because why
C that because
D which that
说明理由
优质解答
The reason why.is that.
之所以.是因为.
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