Tom is not good at maths.He ____________ study it hard._英语解答

Tom is not good at maths.He ____________ study it hard.

人气：213 ℃　时间：2019-10-02 22:23:53

解答

should 应该A. can B. isC. have toD. has to 四选一D 不得不（主语第三人称单数用has to）