Itwasnotuntil1911,thefirstvita

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It was not until 1911, _______ the first vitamin was identified, _______ people realized the importance of it．

A．when; which

B．when; that

C．that; which

D．that; that

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At the railway station,the mother waved goodbye to her son until the train was .

A．out of sight	B．out of reach
C．out of order	D．out of place

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The door opens and there ____.

A．enter the teacher of English and head teacher

B．enters the teacher of English and head teacher

C．does the teacher of English and head teacher

D．the teacher of English and head teacher enter

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-Why are you still here? Everybody has gone to attend the lecture by the president.
-Oh, I ____ about it!

A．didn’t inform	B．hadn’t been informed
C．haven’t informed	D．wasn’t informed

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All the photographs in this book, ____ stated otherwise, date from the 1950s.

A．once	B．until
C．unless	D．if

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-He had a headache and went to drugstore to get something for his pain ____.
-But the form cannot be signed by anyone ____ himself.

A．relax; rather than

B．relief; other than

C．leisure; rather than

D．comfort; other than

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