【題目】Susan has the flu. She go to the doctor.

A. must B. has to C. can D. have to

【答案】B

【解析】句意:Susan得了流感,她不得不去看醫(yī)生。must表示必須,這里是客觀原因;have to表示必須,不得不,這里表示主觀原因,主語(yǔ)是第三人稱單數(shù),這里have要變第三人稱單數(shù)。根據(jù)題意,故選B。

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