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

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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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