问题
选择题
—I’m going to the United States.
—How long ______ you ______ in the United States?
A．are; stayed
B．are; staying
C．have; stayed
D．did; stay
答案
答案：B
考查时态。句中用现在进行时表示将来。句意：你将在美国呆多长时间？选B。
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