单项选择题

A．worked
B．engaged in
C．busy
D．engaged
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单项选择题
A．talkedB．taughtC．lecturedD．spoke
A．talked
B．taught
C．lectured
D．spoke
单项选择题
A．speciallyB．particularlyC．especiallyD．surprisingly
A．specially
B．particularly
C．especially
D．surprisingly
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