The reason ____ he explained to us was ____he overslept.
#78026
A
why; that
B
why; because
C
that; because
D
which; that
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The pen ________ he is writing is mine. 
#75605
A
with which
B
in which
C
on which
D
by which
Recently I bought an ancient Chinese vase,________ was very reasonable.
#75823
A
the price of it
B
its price
C
the price of which
D
the price of whose
Nowadays, sending e-mails to each other has become a way ______________ what they think to others.
#78165
A
many a student expresses
B
in which more than one student express
C
that most of students express
D
the majority of students expresses