题目内容

【题目】It's ten o'clock. The students ________ a maths lesson.

A. have B. having C. are having D. is having

【答案】C

【解析】

句意:十点了。学生们……数学课。本句是现在进行时,构成be+doing,主语是复数,beare,have-having正在上,故选C.

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