单项选择题

I find the article difficult______.

A. to understand
B. to be understood
C. understanding
D. understand
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单项选择题
Do you think Stephen Hawkins is the greatest man______
A. alive
B. lively
C. live
D. living
单项选择题
Some words are hard to ______ because they have many different uses.
A. express
B. explain
C. define
D. describe
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