_____ his work, he would do it till it was finished.A、Once Charles would startB

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问题 _____ his work, he would do it till it was finished.

选项 A、Once Charles would start
B、Once Charles started
C、Since Charles would start
D、Since Charles started

答案 B

解析 once意为“一旦……就……”，主句为将来时，时间状语从句不用将来时，而用现在时或过去时表示将来或过去要发生的动作，故选B。since的意思是“自从”或“由于”，与题意不符。

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