题目内容
—Could you come to the party this weekend?
—I'm afraid I can't join you. I _______ look after my grandma.
—I'm afraid I can't join you. I _______ look after my grandma.
[ ]
A. used to
B. have to
C. prefer to
D. belong to
B. have to
C. prefer to
D. belong to
B
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