单项选择题

This kind of material was seldom used in building houses during the Middle Ages.

A．never
B．rarely
C．often
D．only
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She was grateful to him for being so good to her.
A．careful
B．hateful
C．beautiful
D．thankful
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He is certain that the dictionary is just what I want,
A．sure
B．angry
C．doubtful
D．worried
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