摘要： you work more efficiently are you able to catch up with others in the class. (A) Only when Unless (D) Until
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________ you work more efficiently are you able to catch up with others in the class.
A．Only when B．Long before
C．Unless D．Until
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________ you work more efficiently are you able to catch up with others in the class．
- A.Only when
- B.If
- C.Unless
- D.Until