Factory workers (had to) work (very hard) before, (so) (had farmers).A、had toB、

游客2025-03-16 7

问题 Factory workers (had to) work (very hard) before, (so) (had farmers).

选项 A、had to
B、very hard
C、so
D、had farmers

答案 D

解析应改为did farmers。以so开头的倒装句，可以用助动词do／did／does代替前面的动词。

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