问题
选择题
The watch was a _______ from my mother.
A． gifts
B． present
C． presents
D． something
答案
答案：B
由a可知用名词单数，present指礼物。
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The watch was a _______ from my mother.
A． gifts
B． present
C． presents
D． something
答案：B
由a可知用名词单数，present指礼物。
2SO3(g) 的平衡体系中，当分离出SO3时，下列说法中正确的是（ ）