—Whydidntyoustophergoingswimmi

— Why didn't you stop her going swimming alone?
— She had left the room _____ I had time to do it．

A．after

B．before

C．till

D．as

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33．Before she______thethe door, she____what had happened to her computer．

A．walked;noticed	B．walked; had noticed
C．walks; has noticed	D．had walked; noticed

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32．They said his lack____experience could lead to a disaster and he should ask for nec- essary help．

A．of

B．in

C．for

D．To

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31．-----She missed her train to London,____she didn"t seem to care．
---- Well, there is anotherl one in 15 minutes．

A．or

B．as

C．thus

D．Yet

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30．Mr．Snuth advised us to________a written agreement even it was just a small deal．

A．hold on

B．insist on

C．believe in

D．rely on

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29．There are also instructions about the________of all the buttons and switches．

A．purpose

B．function

C．power

D．Effect

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