单项选择题

A．should
B．must
C．ought to
D．would
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单项选择题
A．to improveB．improvingC．to improvingD．of improving
A．to improve
B．improving
C．to improving
D．of improving
单项选择题
A．Go out to work.B．Listen carefully to John.C．Be calm and patient.D．Do the easiest thing.
A．Go out to work.
B．Listen carefully to John.
C．Be calm and patient.
D．Do the easiest thing.
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