问题补充:
—I am going to America.
—how longyouthere?
A. are; stayed
B. are; staying
C. have; stayed
D. did; stay
答案:
A. are; stayed
(答案→)B. are; staying
C. have; stayed
D. did; stay
解析:本题考查时态。此处用进行时态表将来。
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