Anewtechniqueout,theyields(收成)

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A new technique ____ out, the yields (收成) increased by 20% .

A．having working	B．having been working
C．has worked	D．had been worked

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What worried the child most was _____________ to visit his mother in the hospital.

A．to his being allowed	B．his not being allowed
C．not his being allowed	D．not his allowed

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Some people try to knock me down, only______ me more determined to do better.

A．to make

B．makes

C．having made

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A．being kept

B．keeping

C．kept

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A．envy among

B．the envy of

C．the envy at

D．envy it

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The hospital _________ well, where many wounded ________every day.

A．is operated; operation	B．operates; are operated on
C．operates; are operated	D．operates; operates on

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