—Why did Mr. Green take his 7th grade students to the river yesterday afternoon?

题干

—Why did Mr. Green take his 7th grade students to the river yesterday afternoon?
—________ the river.

A．Cleaned up	B．Cleaning up
C．To clean up	D．Clean up

上一题下一题 0.64难度单项选择更新时间:2014-12-02 03:24:51

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