---Why does Tommy look unhappy ?--- Because his teacher makes him _______ the cl

题干

---Why does Tommy look unhappy ?
--- Because his teacher makes him _______ the classroom all by himself .

A．to clean

B．clean

C．cleans

D．cleaning

上一题下一题 0.65难度单选题更新时间:2012-05-29 04:01:30

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