单项选择题

They found the lecture hard ______.

A. to understand
B. to be understood
C. to have been understood
D. to have understood
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单项选择题
John asked his mother to ______ the hole in the pocket of his jeans.
A. fill
B. fix
C. mend
D. repair
单项选择题
I suggested that he was ______ of help from the Royal Literary Fund.
A. worthless
B. worthwhile
C. worthy
D. worth
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