Sentence Correction (SC) | Re: By the mid-1700s, when it began a concerted effort to prevent famine a

IMO A

If you draw the logic timeline of the events and the time marker of the sentence "By(Until) mid-1700" - French government have to realize sth first before begin to start sth

Thus A is the only choice show this timeline

Note: functions of verb are to index are 1) action and 2)timeline of that action


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