题目内容
20．我们应该利用好每一次用来练习说英语的机会．Every chanceshould be made good use of to practice speaking English．
分析 我们应该利用好每一次用来练习说英语的机会．
解答 答案：should be made good use of．考查情态动词的被动．make good use of表示"好好利用"，它和主语Every chance之间是被动关系，所以用情态动词的被动．
点评 考查情态动词的被动．
情态动词的被动语态结构为：情态动词+be+过去分词； 其时态及句型的变化仅由情态动词完成，"be+过去分词"部分不变．
Tables can be made of stone．桌子可由石头制造．
Tables could be made of stone at that time．那时桌子可由石头制造．（一般过去时）
Can tables be made of stone？桌子能用石头制造吗？（疑问句）
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