补全短文
Those women were carefully selected from among many applicants. ________ They were not allowed to smoke or drink alcohol during the tests, and they were expected to tolerate each other’s company at close quarters for the entire period.
A、Some of them were over 65.
B、Results of the tests suggest that women will have significant advantages over men in space.
C、At the end of ten days, they had to spend a further twenty days absolutely confined to bed.
D、They were volunteers and the pay was barely above the minimum wage.
【正确答案】 D
【答案解析】 空格之后的句子都是“they were”的排句结构，内容都是对受试者的要求或试验内容。因此答案为D。
