They ________ busy doing their homework.

[  ]

A.

is

B.

am

C.

are

D.

/

答案:C
解析:

  考查系動(dòng)詞。主語(yǔ)they是復(fù)數(shù)形式,系動(dòng)詞應(yīng)用are。故選C項(xiàng)。


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