以下句子各选什么?是什么从句?
问题描述：
以下句子各选什么?是什么从句?
8.I relly think I should have been invited to the meeting.I'm very unhappy ___ I wasn't.
A.why B.when C.that D.what
9.I think ___ John will return in a few days.
A.when B.where C.that D.whether
10.I wonder ____ of them knows you.
A.which B.who C.whose D.whom
答
8.c
9.c
10.a