单项选择题

______ explanation is necessary.

A．Farther
B．Further
C．Farthest
D．Furthest
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单项选择题
He washed his face ______.
A．cleaned
B．cleaning
C．to be clean
D．clean
单项选择题
To my surprise, the strict teacher smiled at me ______ when I answered his question.
A．friendly
B．in a friend's way
C．with anger
D．in a friendly manner
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