He is busy _______ his storybook.A．writeB．writingC．writesD．to write_刷题宝

题干

He is busy _______ his storybook.

A．write	B．writing
C．writes	D．to write

上一题下一题 0.65难度单选题更新时间:2019-02-20 06:26:31

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