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E
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A．The man paid a lot to join the gym.B．The man has been working too hard.C．The man has improved his physical condition.D．The man should ask for mere pay.
A．The man paid a lot to join the gym.
B．The man has been working too hard.
C．The man has improved his physical condition.
D．The man should ask for mere pay.
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He found it very difficult____________(赶上)the development of physics.
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