问题
you been to the United States—Yes, only once. I ________ there only for seven days.
A:have stayed
B:was staying
C:stayed
D:had stayed;
B:was staying
C:stayed
D:had stayed;
正确答案是：
同类题型
I think _______ a foreign language is not easy. You should _______ it often.
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an to open to the outside world inthe late 1970s.,there have been great changes inthe country.
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