单项选择题


A．must
B．had to
C．should
D．ought
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单项选择题
A．becameB．wentC．keptD．started
A．became
B．went
C．kept
D．started
单项选择题
A．playedB．startedC．thoughtD．learned
A．played
B．started
C．thought
D．learned
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