What do you think of his proposal that improvements( )in the old type of vacuum cleaner?
考试：MBA考试
科目：英语（在线考试）
问题：
A：be made
B：will be made
C：would be made
D：will have to be made
答案：
解析：
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What do you think of his proposal that improvements( )in the old type of vacuum cleaner?
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