两个英语题的疑问1.______ by a greater demand for vegetables ,farmers

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两个英语题的疑问
1.______ by a greater demand for vegetables ,farmers have built more green houses.Driven 其中还有一个选项 Being driven 为什么不可以呢?因为现在分词做状语可以表示原因啊.
2.All that can be done ______ been done.这里答案用的是has,那么为什么不用have呢?如果说要强调整体概念,这里没有这个必要,因为“所有能做的事情”,明显是一个复数概念啊.

1.这是个省略句.相当于一个原因状语从句.because farmers are driven by a greater demand for vegetables.
2. all tha=what 句子作主语谓动词用单数.所以用has.

______ by a greater demand of vegetables,farmers have built 2题非谓语选择题1._____by a greater demand for vegetables,farmers ha ________ by a greater demand of vegetables,farmers have buil [-A81] _______ by a greater demand of vegetables, farmers ha ___by a greater demand of vegetables,farmers have built more _____by a greater demand of vegetables,farmers have built mo His parents used to ______ a living by growing vegetables. 帮做英语题单项选择1.The farmers in Shandong ______ wheat.A.make B.gro 什么叫做Demand for a product 请用英语回答关于money demand function的疑问? 八上英语的填空题1.A:How ______ you ______ (go) to Shanghai ,by air o 两个英语句子的疑问,.