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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