【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，be用are，have-having正在上，故选C.
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