问题
选择题
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
答案：D
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。