---Mary hasn't written to us for a long time.---What do you suppose __ to her?
#73595
A
happened
B
to happen
C
was happened
D
having happened
推荐题目
He fell off the bike ________.
#41254
A
while he rode
B
while he was riding
C
while he is riding
D
while on bike
The hard-working farmers and their happy life _____ we saw in the countryside made a wonderful impression on us.
#70122
A
whom
B
who
C
which
D
/
The clock was striking twelve ______ down the street.
#74557
A
because I walked
B
as I walked
C
since I was walking
D
while I was walking
The science of medicine, _____ progress has been very rapid lately, is perhaps the most important of all the science.
#70005
A
all whose
B
all what
C
all that
D
all which