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--have you ever been to Beijing before?--No. it is the first time that I ____here.
#93080
A
am
B
be
C
have been
D
had been
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This machine is very easy ______. Anyone can learn to use it in a few minutes.
#92224
A
operating
B
to be operating
C
operated
D
to operate
Is oxygen the only gas _______ helps fire burn?
#95032
A
that
B
/
C
which
D
it
--have you ever been to Beijing before?--No. it is the first time that I ____here.
#93080
A
am
B
be
C
have been
D
had been
______ wind or rain, we always go to school on time.
#93535
A
Whether
B
If
C
No matter
D
Regardless of
 Would you explain _____?
#94892
A
the meaning to us
B
us the meaning
C
us to the meaning
D
the meaning us