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14.While _____ the food with the microwave oven,I heard someone ______ at the door.
A.heated; knocking B.heating; knocking
C.heat; knocking D.be heated; knocks
人气:225 ℃ 时间:2020-02-04 03:03:36
解答
B.heating; knocking
两个动作是同时正在进行的
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