–Do you know the boy ___ is standing under the tree?-Yes, he is my friend, Peter.
#43123
A
what
B
who
C
whom
D
whose
推荐题目
Some of the students are afraid of the teachers _____ strict with them.
#42793
A
who is
B
who are
C
that is
D
that have
—Did you return from Shanghai on time?—No. The train________ I took was late because of the bad weather.
#43091
A
what
B
who
C
which
D
where
