单项选择题

I don't quite follow what she is saying.

A. observe
B. understand
C. explain
D. describe
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单项选择题
Cement was seldom used in building during the Middle Ages.
A. crudely
B. rarely
C. originally
D. symbolically
单项选择题
We shall take the treasure away to a safe place.
A. clean
B. pretty
C. distant
D. secure
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