单项选择题


A．wonder
B．widen
C．wander
D．concentrate
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单项选择题
A．have beenB．are nowC．maybeD．are to be
A．have been
B．are now
C．maybe
D．are to be
单项选择题
A．understandingB．understandableC．understoodD．underlined
A．understanding
B．understandable
C．understood
D．underlined
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