--- What do you think of the math problem ?
--- It’s very hard and nobody has _______.
A．put it outB．helped it outC．worked it outD．solve
C

試題分析：句意：——這道數(shù)學(xué)題你認(rèn)為怎么樣？——我認(rèn)為非常難，沒有人能算出它。worked out算出，put out生產(chǎn)、伸出，help out幫助，solve解決（問題）
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