问题
选择题
—Is Tom at school today?
—No, he is at home _____ his mother is ill. [ ]
A. when
B. but
C. if
D. because
答案
答案：D
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—Is Tom at school today?
—No, he is at home _____ his mother is ill. [ ]
A. when
B. but
C. if
D. because
答案：D