填空:What are you doing?Tim ( )(paint) a picture.

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填空:What are you doing?Tim ( )(paint) a picture.
填空:What are you doing?Tim ( )(paint) a picture.

填空:What are you doing?Tim ( )(paint) a picture.
is painting

is painting
现在进行时 be + doing
Tim 是第三人称单数,所以用is