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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】We want to know ______ better.[ ]
A.
what to swim
B.
how to swim
C.
swimming
D.
to swim
【单选题】The big fire wasn’t put out __________ twelve o’clock last night.
A.
when
B.
if
C.
until
【单选题】—______milk do we need?—Just one cup.[ ]
A.
How much
B.
How long
C.
How often
D.
How many
【单选题】The doorbell is ringing．It _________ Alice , because she__________ Washington.The doorbell is ringing. It _________ Alice , because she__________ Washington.
A.
can’t be; has gone to
B.
may be; has been to
C.
mustn’t be; has gone to
D.
can’t be; has left to
【单选题】—Is the baseball under the bed?—_____. I can't see it.[ ]
A.
No, they aren't
B.
Yes, it is
C.
No, it isn't
D.
Yes, they are
【单选题】Many people shop on line, ________ years ago, they bought things only from stores.
A.
and
B.
so
C.
but
D.
or
【单选题】The girl was heard _____ the song every morning. [ ]
A.
sing
B.
sang
C.
to sing
D.
singing