10、______ you master an effective method to study French____ make great progress in a short time．

A．Only if; will you                                  B．Only if; you will

C．Unless; will you                                    D．Unless; you will

10、A

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______ you master an effective method to study French____ make great progress in a short time．

A．Only if; will you                                  B．Only if; you will

C．Unless; will you                                    D．Unless; you will

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