I can remember well some pictures and the persons I saw in the room.
#42904
A
whom
B
who
C
that
D
which
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We will never forget those happiest days _______ we spent on the summer camp.
#42644
A
which
B
that
C
when
D
on which
The English-Chinese dictionary ____my father bought for me many years ago is so useful.
#42665
A
whose
B
who
C
that
D
what