What do you think of his proposal that improvements __________ in the old type o

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问题 What do you think of his proposal that improvements __________ in the old type of vacuum cleaner?

选项 A、be made
B、will be made
C、would be made
D、have made

答案 A

解析空白处前面有proposal，后面的that引导同位语从句，此时，使用should，又因为从句中主语improvements和动词make之间为被动关系，因此，空白处填入should be made ，其中should可省略。故选A。

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