.Thereasonforallthechangesbein

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. The reason for all the changes being made _______to us yet.

A．has not explained	B．has not been explained
C．did not explained	D．were not explained

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________you may have，you should gather your courage to face the challenge.

A．However a serious problem

B．What a serious problem

C．However serious a problem

D．What serious a problem

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I used to love that film________I was a child，but I don’t feel it that way any more.

A．once	B．when
C．since	D．although

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There were some chairs left over________everyone had sat down.

A．when	B．until
C．that	D．where

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A．when	B．while
C．after	D．since

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Tom was about to close the window　　　　his attention was caught by a bird.

A．when	B．if
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