单项选择题

I ______ to post the letter that I wrote to my parents, but I was too busy.

A．remembered
B．must remember
C．had remembered
D．should have remembered
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单项选择题
Though people plant many trees in this area every year, the top of some hills is still ______.
A．open
B．bare
C．empty
D．blank
单项选择题
The furniture that he bought last week ______ quite modern.
A．is
B．are
C．has been
D．have been
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