单项选择题

I saw lying on his doormat a letter ______ to him from the U.S.A.

A. addressing
B. addressed
C. to address
D. being addressed
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单项选择题
We still have a lot of problems ______.
A. unsolved
B. insolving
C. unsolve
D. to be unsolved
单项选择题
Your explanation will make the things ______.
A. even more complicated
B. to be even more complicated
C. that became even more complicated
D. be even more complicated
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