问题
选择题
—Listen! Someone ____________ on the street.
—Singing? He is crying.
A. is singing B. sing C. sings
答案
答案：A
题目分析：听，有人正在街上唱歌。听，说明动作正在进行，故用现在进行时：be doing,故选A。
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—Listen! Someone ____________ on the street.
—Singing? He is crying.
A. is singing B. sing C. sings
答案：A
题目分析：听，有人正在街上唱歌。听，说明动作正在进行，故用现在进行时：be doing,故选A。