onMayDay,theShanghaiExpohasatt

_____ on May Day, the Shanghai Expo has attracted tens of thousands of visitors around the world every day．

A．Having opened	B．Opened
C．Opening	D．To open

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There are so many viruses on the Internet. If ______ accidentally, the viruses may make your computer break down.

A．downloading	B．to be downloaded
C．downloaded	D．being downloaded

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I _______ to your party, but I was prevented by the heavy rain.

A．had meant to come	B．was about coming
C．have meant to come	D．meant coming

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---Where did you come across your old classmate Jane?
---It was in the supermarket _______ she worked _______ I came across her.

A．where; when	B．that; when
C．that; that	D．where; that

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However, at times this balance in nature is ______, resulting in a number of unforeseen effects.

A．troubled

B．disturbed

C．confused

D．Puzzled

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Harry Potter is said _______ into over twelve languages by the end of last year.

A．to be translated	B．being translated
C．having been translated	D．to have been translated

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