问题补充：
At the class meeting, he made two suggestions, were of great value.
A. all of them
B. all of which
C. both of them
D. both of which
答案：
A. all of them
B. all of which
C. both of them
(答案→)D. both of which
解析：考查定语从句。先行词为two suggestions，可排除A、B两项，C项前加上and 也对，故答案选D。句意：在班会上他提出了两条建议，都非常的有价值。
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