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

解析试题分析：句意：——这道数学题你认为怎么样？——我认为非常难，没有人能算出它。worked out算出，put out生产、伸出，help out帮助，solve解决（问题）
考点：考查动词词组。