题干
Don’t worry _______ your cat.I can look after it.
A：to
B：about
C：in
D：at
答案(点此获取答案解析）
B
Don’t worry _______ your cat.I can look after it.
A：to
B：about
C：in
D：at
。有机物X的键线式为：
。下列说法不正确的是
