问题
选择题
I have often heard the"ABC Song"____,but I have never heard Alice_____it. [ ]
A. to be sung;to sing
B. being sung;sang
C. sung;sing
D. sang;singing
答案
答案：C
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I have often heard the"ABC Song"____,but I have never heard Alice_____it. [ ]
A. to be sung;to sing
B. being sung;sang
C. sung;sing
D. sang;singing
答案：C
②
、NO、
的还原性强弱顺序是