问题补充：
We sightseeing tomorrow.
A. go
B. goes
C. are going
D. is going
答案：
A. go
B. goes
(答案→)C. are going
D. is going
解析：句意：我们明天去观光。现在进行时表将来，be+动词现在分词；主语是we，be用are，故选C。
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