——ItisalongtimeIsawyoulast．——Y

——It is a long time _____I saw you last．
——Yes．And it will be a long time _____ we see each other again．

A．when; before

B．after; when

C．since; before

D．since; until

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Radium salts，which have been found to ______ in bones，give rise to bone cancer.

A．pile up　

B．build up

C．keep up　

D．pull up

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Our teacher insisted that the key words worth paying attention _______ before class.

A．be underlined	B．being underlined
C．to be underlined	D．to being underlined

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With some technical problems to be solved, it may be a while _______ the system is put into use.

A．when

B．after

C．since

D．before

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That is the only way we can imagine _______ the overuse of water in students’ bathrooms.

A．reducing

B．to reduce

C．reduced

D．reduce

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A great deal of advanced science and technology has been _______ since China carried out the reform and opening policy.

A．brought down

B．brought in

C．brought out

D．brought up

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