问题补充：
Though they had a meeting yesterday, there is still much that remains.
A. to solve
B. to be solved
C. solving
D. solved
答案：
A. to solve
(答案→)B. to be solved
C. solving
D. solved
解析：remain后面要求不定式做表语，根据题意这里要被动形式，所以选B。
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