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-- What’s Carol doing? -- She’s busy letters. A. writing B. write C. wrote D. to write 【查看更多】

 

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—What's Carol doing?
—She's busy ______ letters.

[     ]

A. writing
B. write
C. wrote
D. to write

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— What’s Carol doing?

— She’s busy _____________ letters.

A. writing          B. write            C. wrote           D. to write

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