问题

What is Tom up to? He’s seldom turned in his assignments these days, ________?[ ]
A: is he
B: isn't he
C: has he
D: hasn't he
B: isn't he
C: has he
D: hasn't he
正确答案是:
同类题型
Bill often goes to the doctor.Why—Because he ________ exercises or eats vegetables.
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