问题补充：
— Do you know when he the trip to the USA?
— Perhaps next week, but I’m not sure.
A. makes
B. made
C. has made
D. is making
答案：
A. makes
B. made
C. has made
(答案→)D. is making
解析：答句next week提示问句中make the trip是将来的动作。D项is making为进行时表“将来”，故D项正确。
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