问题补充：
He said that his friend there three days before, but she was not there.
A. had been; now
B. has been; then
C. had been; then
D. was; now
答案：
A. had been; now
B. has been; then
(答案→)C. had been; then
D. was; now
解析：考查时态和副词。句意：他说他的朋友三天前在那里的，但是她那时不在那。第一句子有three days before说明使用过去完成时，第二句中的时态是一般过去时was，故时间状语使用then，而不是now，因为Now用于一般现在时。故C正确。
