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I found his theory difficult . [ ]A. understand B.to understand C. understood D.

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I found his theory difficult . [ ]A. understand B.to understand C. understood D.

I found his theory difficult________.          [     ]A. understand    
B.to understand    
C. understood    
D.to be understood

试题答案

B

标签：theorydifficultfoundhisunderstood

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