2. 外语
  3. Because it decomposes violently when disturbed, ______must be handled cautiously.

Because it decomposes violently when disturbed, ______must be handled cautiously.

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问题 Because it decomposes violently when disturbed, ______must be handled cautiously.
选项 A、nitroglycerin
B、it’s nitroglycerin
C、for nitroglycerin
D、nitroglycerin, it
答案A
解析 The noun nitroglycerin is the subject of the main clause.
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