问题
选择题
I didn't come to the party yesterday evening ______ I had to look after my mother at home. [ ]
A. when
B. why
C. because
D. if
答案
答案：C
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I didn't come to the party yesterday evening ______ I had to look after my mother at home. [ ]
A. when
B. why
C. because
D. if
答案：C