单项选择题

I ______ a very interesting program on the radio this morning.

A． listened
B． heard
C． heard of
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单项选择题
The book is ______ difficult for me. Can you show me some others
A． very
B． not
C． too
单项选择题
They finally ______ an agreement after ten days of hard negotiation.
A． performed
B． reached
C． drew
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