问题
选择题
What _____ you _____ when I called you? [ ]
A. are; doing
B. were; doing
C. did; do
D. can; do
答案
答案：B
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What _____ you _____ when I called you? [ ]
A. are; doing
B. were; doing
C. did; do
D. can; do
答案：B