问题
选择题
—When ______ the Greens ______ the Great Wall?
—Last Sunday. [ ]
A. do; visited
B. are; visiting
C. were; visiting
D. did; visit
答案
答案：D
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—When ______ the Greens ______ the Great Wall?
—Last Sunday. [ ]
A. do; visited
B. are; visiting
C. were; visiting
D. did; visit
答案：D