He must be helping the old man to water the flowers, ________?[ ]A. is he B

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He must be helping the old man to water the flowers, ________?[     ]
A. is he
B. isn"t he
C. must he
D. mustn"t he

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举一反三

It"s the first time that he has been to Australia, ________?[     ]
A. isn"t he
B. hasn"t he
C. isn"t it
D. hasn"t it

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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

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I don"t suppose anyone will volunteer, ________?[    ]
A. do I
B. don"t I
C. will they
D. won"t they

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— I don"t suppose Jimmy could have done well in the midterm exam last week, ________?
— ________, he almost failed in the exam.[     ]
A. had he; Yes
B. did he; No
C. do I; Yes
D. could I; No

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There"s no light on in the dormitory. They must have gone to attend the concert to be held on the
campus, ________?[     ]
A. didn"t they
B. mustn"t they
C. haven"t they
D. shouldn"t they

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