题干
I’ve no idea how much work it is to be _____ a World Expo but I’m sure they’ve done a lot.
A：in favor of
B：in response to
C：on behalf of
D：in charge of
答案(点此获取答案解析）
D
；②
；③
；④
；⑤
，其中错误写法的个数为 （ ）