问题

The real evidence is the least of our worries ______ we have known about it.
A:since
B:though
C:unless
D:while;
B:though
C:unless
D:while;
正确答案是:
同类题型
Tom studies harder this term. _________, he has made great progress in his lessons.
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Not only ______ a school in his hometown, but also he built a new hospital there.