Listen!A girl ( )(sing) in the office now.

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Listen!A girl ( )(sing) in the office now.
Listen!A girl ( )(sing) in the office now.

Listen!A girl ( )(sing) in the office now.
正确答案:is singing Listen! 体现现在进行时结构.

Listen!表示是现在进行时
所以用 is singing

is singing

Listen!A girl (is singing)(sing) in the office now. 典型的现在进行时