________ of plastics， the machines are light in weight.[ ]A．To make B．Havi

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________ of plastics，  the machines are light in weight.[     ]
A．To make
B．Having made
C．Being made
D．Made

答案

举一反三

There is a new problem ________ in the popularity of private cars that road conditions need improving. [     ]
A. involved
B. to involve
C. involving
D. being involved

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The little girl stood there,   not knowing what to do,   ________ by what she had seen. [     ]
A. terrified
B. terrifying
C. being terrified
D. was terrified

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She sat at her desk,   with her eyes ________ on the book,   ________ in its plot. [     ]
A. fixing;  absorbing
B. fixed;  absorbed
C. fixed;  absorbing
D. fixing;  absorbed

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After his wife died in an accident,   he had to keep himself________to forget his sorrow for the time being. [      ]
A. occupy
B. occupying
C. occupied
D. to occupy

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The air has leaked out of this football. Could you get it________up?[     ]
A. blow
B. blowing
C. blown
D. to blow

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