单项选择题


A．learned
B．studied
C．wanted
D．found
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单项选择题
A．easyB．easierC．difficultD．difficulty
A．easy
B．easier
C．difficult
D．difficulty
单项选择题
A．occurB．occursC．occurringD．occurred
A．occur
B．occurs
C．occurring
D．occurred
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