After visiting China, most of the foreign friends said they would never forget the time      _________they had spent in China.
#69764
A
what
B
that
C
when
D
at which
推荐题目
I will put the book________you placed it and make a mark at the place________I put it.
#67077
A
where;at which
B
at which;at which
C
where;which
D
at which;where
 Here are all the books I have.You may borrow _______ you like.
#72661
A
that
B
which 
C
however
D
whichever