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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