2. 考研
  3. Year after year a dedicated Swedish chemist worked to find a substance which, when (1)_____ nitroglycerine(硝化甘油), would make exp

Year after year a dedicated Swedish chemist worked to find a substance which, when (1)_____ nitroglycerine(硝化甘油), would make exp

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问题     Year after year a dedicated Swedish chemist worked to find a substance which, when (1)_____ nitroglycerine(硝化甘油), would make explosives safer to handle (2)_____ weakening their force. He had a personal (3)_____ scientific reason to pursue his search, because his (4)_____ brother had been killed when a can of nitroglycerine (5)_____ exploded. The oily liquid had been (6)_____ for so many disasters that its (7)_____ had finally been outlawed by many countries.
    While (8)_____ a new formula one morning, the doctor broke a test tube and gashed(划开) his finger. He was daubing(涂搽) the (9)_____ with collodion(火棉胶), a coating solution of gun-cotton dissolved in ether-alcohol(乙醚), (10)_____ the idea struck him-mix collodion with the nitroglycerine! (11)_____ was the answer. The new mixture, (12)_____ blasting gelatine(爆胶), was not only (13)_____ safe to handle as dynamite, but it was also one-and-a-half times more powerful! In fact, so powerful (14)_____ that it paved the way for a whole new (15)_____ in construction and engineering. Mines were (16)_____, roads were built, and canals were cut at a speed once (17)_____ impossible. It had another use, also-death and destruction in warfare. Its inventor had believed that the power of his new (18)_____ would so awe the military mind that it would actually be a deterrent to war. (19)_____ it became a weapon that brought death to millions of soldiers and (20)_____.

选项 A、when
B、as
C、then
D、while
答案A
解析 本题考查对连词的掌握情况。主句中动词用进行时态，而由when引导的从句中用一般时态，表示在动作的过程中动作执行者突然想起或见到某事或某物。
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