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【单选题】
Scientists still wonder ______ cloning will help or harm us and _____ it is leading us.
A.
that; what
B.
whether; where
C.
if; that
D.
whether; how
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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】The Internet has become increasingly popular, ______ us to see as well as to hear all kinds of programmes.
A.
to allow
B.
allowing
C.
allowed
D.
having allowed
【单选题】As they were walking around, they noticed a man _______ against a tree.
A.
sit
B.
to sit
C.
sitting
D.
sat
【单选题】His teacher insisted that he ____ his hair ____ the next day．
A.
had, to cut
B.
have, cut
C.
would have, to be cut
D.
should have, to cut
【单选题】Had she ___________ her promise, she could have made it to Stanford University. [ ]
A.
looked up to
B.
lived up to
C.
kept up with
D.
come up with
【单选题】--Take a short rest, will you ? --Ok, I’m ___tired after a long walk.
A.
more or less
B.
more and more
C.
as a result
D.
fox example
【单选题】I worked as hard as I could _______ for the final exam.
A.
to prepare
B.
prepare
C.
preparing
D.
prepared
【单选题】290．The little girl ________ of her own face in one of the shop windows and she felt countrified(土里土气) by herself.
A.
caught sight
B.
caught sigh
C.
looked
D.
looked into.
【单选题】The mother who lost her son insisted that the careless driver for the traffic accident ___ yesterday .
A.
was to blame ; happening
B.
be to blame ; happened
C.
be blamed ; was happened
D.
was to blame; had happened