What do you think of his proposal that improvements ______ in the old type of vacuum cleaner? Abe made Bwill be made Cwould be made Dwill have to be made

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

Abe made
Bwill be made
Cwould be made
Dwill have to be made

出自：新疆广播电视大学-大学英语（一）

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