We really enjoyed the school trip yesterday, it rained in the afternoon and some of us got wet.
A. though
B. because
C. unless
D. after
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(答案→)A. though
B. because
C. unless
D. after
解析：A. though尽管 ，虽然 B. because 因为 C. unless除非 D. after在…之后；句意：我们真的喜欢昨天学校组织的旅行，虽然下午下雨了，一些人都淋湿了。故选A