If Jack________here yesterday, he would have offered assistance to them as much as possible.

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问题 If Jack________here yesterday, he would have offered assistance to them as much as possible.

选项 A、had been
B、were
C、should be
D、was

答案A

解析分析句子结构可知，本句包含一个If引导的非真实条件句。根据从句中的时间状语yesterday(昨天)和主句中的would have offered可知，本句是对过去情况的假设，所以从句的谓语动词应用“had+过去分词”的形式。故选A。

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