inthe1800sandfirstmassproduced

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_______ in the 1800s and first mass-produced in Germany, the harmonica(口琴) was designed to play simple folk tunes.

A．Being invented

B．Inventing

C．Invented

D．Having invented

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The science of medicine, _______ progress has been very rapid lately, is perhaps the most important of all the sciences.

A．to which

B．in which

C．Which

D．with which

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He is _______ to get there in time if he starts right now.

A．possible

B．probable

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D．impossible

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—Which day do you think is all right to our next meeting?
—You make _______,_______ day is all the same to me.

A．one;one	B．it;any
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_______,but he still could not understand it.

A．He had been told many times

B．Having been told many times

C．Told many times

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It was very kind of you to do the washing up, but you _______ it.

A．mustn't have done	B．wouldn't have done
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