单项选择题


A．Sometimes
B．Many times
C．Much time
D．Some time
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单项选择题
A．doneB．having doneC．having been doneD．being done
A．done
B．having done
C．having been done
D．being done
单项选择题
A．boiledB．burntC．burningD．boiling
A．boiled
B．burnt
C．burning
D．boiling
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