【題目】— Where's Mike?
— He is working _____ math _____ in the classroom.
A.in; problem
B.out; problem
C.in; problems
D.on; problems

【答案】D
【解析】考查動(dòng)詞短語(yǔ)。work on“從事于”;work out“算出,解決”;work不與in搭配使用。problem為可數(shù)名詞,本題句意是 “Mike正在教室做數(shù)學(xué)題”,故 選D。

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