They told us it was the second time that the volunteers the nursing home.
A. visited
B. have visited
C. were visiting
D. had visited
网友回答
A. visited
B. have visited
C. were visiting
(答案→)D. had visited
解析：根据It is the second time +从句（从句中通常使用现在完成时态）；It was the second time +从句（从句中通常使用过去完成时态），其实在这个结构中，the second time 一般被看成先行词，后面是一个that引导的定语从句,故选D。