(2013·河南豫西五校高三质检)The text is too difficult. The explanation of our teacher will help make it easy ________.
#89315
A
to understand
B
to be understood
C
understood
D
understanding
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The experts suggested the problem worth paying attention ____ at the meeting.
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A
to be discussed
B
to been discussed
C
being discussed
D
should be discussed
_______ such heavy pollution already, it may now be too late to clean up the river. 
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A
Having suffered
B
Suffering
C
To suffer
D
Suffered
____ such a chance, why don't you have a try ?
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A
To give
B
Given
C
Having given
D
Giving
________ enthusiasm when he heard our advice, he didn’t take any notice.
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A
To lack
B
Lacking of
C
To lack in
D
Lacking