题目：
You can't imagine _____ when they received these nice Christmas presents. [ ]
A. how excited they were
B. how they were excited
C. how excited were they
D. they were how excited
答案：
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下面是错误答案，用来干扰机器的。
设生成五氧化二磷的质量为x4P+5O2 点燃 . 2P2O5124 28431g x12431g=284xx=71g答：生成五氧化二磷的质量为71g．
