请问选那个 I'm going to join them.I'll try my best ______ I do it.A.if B.when C.once D.but

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请问选那个 I'm going to join them.I'll try my best ______ I do it.A.if B.when C.once D.but

C

c
once 这里解释为一旦

c,因为----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------...

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c,因为---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

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