【題目】— What do you think of the math problem?— It's very hard and nobody has __________.
A.put it out
B.helped it out
C.worked it out
D.solve

【答案】C
【解析】句意:你認(rèn)為這道數(shù)學(xué)題怎樣?它很難,沒有人能算出。put out撲滅;help out給與幫助;work out解決;solve解決。解決數(shù)學(xué)一類的問題,常用work out,而解決困難等常用solve。所以選C。

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