1. The millions of calculations involved, had they been done by hand, ________all　practical value by the time they were finished.

　　A.had lost B.would lose

　　C.would have lost D.should have lost

　　2. As a public relations officer, he is said ________some very influential people.

　　A.to have been knowing B.to be knowing

　　C.to have known D.to know

　　3. Our hopes ________and fell in the same instant.

　　A.aroused B.arose

　　C.raised D.rose

　　4. With the development in science and technology man can make various flowers ________ before their time.

　　A.be bloomed B.blooming

　　C.bloom D.bloomed

　　参考答案： C D D C

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