题干
There ______ nobody else at hand, we had to do all this on our own.
A：wa
B：had
C：being
D：to be
答案(点此获取答案解析）
C
A：wa
B：had
C：being
D：to be
）和菲（ 
）都是比较简单的稠环芳香烃，有关它们的说法正确的是（ ）
