单选题
What do you think of his proposal that improvements in the old type of vacuumcleaner?无
A、
be made
B、
would be made
C、
will be made
D、
will have to be made
【正确答案】
A
【答案解析】
在表示命令、 建议、 要求的名词或动词之后的从句必须用虚拟语气should+do， should可以省略。
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