问题补充:
I get the two of them mixed up; they are so similar.
A. at one time
B. at no time
C. in no time
D. all the time
答案:
A. at one time
B. at no time
C. in no time
(答案→)D. all the time
解析:考查介词短语。at one time以前,曾经;at no time绝不;in no time立刻,马上;all the time一直;句意:我一直搞不清楚他们俩,他们是如此的类似。