—What did you do last night?
—I my homework but nothing else.
A. did
B. was doing
C. has done
D. had done
网友回答
A. did
(答案→)B. was doing
C. has done
D. had done
解析：主要测试动词时态。有些考生看到上文提及的时间状语last night，马上想到用过去时，于是误选A。其实，从后面的信息but nothing else可以看出，回话者强调昨晚一直在做作业，于是正确答案选B。过去时表示过去已经做了的事情，常与过去时间状语连用，暗含完成；过去进行时也可与过去时间状语连用，但是强调在过去某时间内一直在做某事，没有做别的事，但不一定完成。如：
I read the story last night. 我昨晚看了这个故事。
I was reading the story last night. 我昨晚一直在看这个故事。