Question

--- 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

Answer 1

C

解析試題分析：句意：——這道數學題你認為怎么樣？——我認為非常難，沒有人能算出它。worked out算出，put out生產、伸出，help out幫助，solve解決（問題）
考點：考查動詞詞組。