问题补充：
—What were you doing when Lucy in yesterday?
—I had just finished my homework and to take a shower.
A. dropping；start
B. had dropped；started
C. dropped；have started
D. dropped；was starting
答案：
A. dropping；start
B. had dropped；started
C. dropped；have started
(答案→)D. dropped；was starting
解析：
句意为：——昨天Lucy来访的时候你在干什么？——我(那时)刚写完作业正要开始洗澡。第一空后面有yesterday所以用一般过去时；第二空强调那时正要做某事。
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