Itneveroccurredtohumansuntilth

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It never occurred to humans until the mid-1990s ______ some animals can be cloned.

A．where

B．that

C．when

D．what

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________more about university courses, call (920) 746-3789.

A．Finding out

B．Find out

C．To find out

D．Having found out

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If _______ in class, you will have to clean the classroom for a week as a punishment.

A．caught sleeping

B．caught to sleep

C．catching sleeping

D．to catch to sleep

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He did nothing but ________walk in the street.

A．taking　　　　

B．take　　　　

C．to take　　　　

D．took

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The murderer was brought in, with his hands _______ behind him.

A．being tied

B．having tied

C．to be tied

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The first edition ________ in 1955 and ________ a best seller ever since．

A．was published；had been	B．was published；has been
C．has been published；has been；	D．had been published；had

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