问题补充:
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
答案:
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。