______ his work, he would do it till it was finished.

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问题 ______ his work, he would do it till it was finished.
本题测试的是状语从句的用法。once意为“一旦……就”。通常如果once引导的从句中谓语动词用现在时,主句则用将来时;如果once引导的从句中谓语动词用过去时,主句则用过去将来时。因此本题答案为B。

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

答案B

解析
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