题目内容
He is always serious ________ his work.
- A.about
- B.in
- C.on
- D./
A
解析:本题考查be serious about sth的用法。B、C项介词搭配错误,D项缺少介词,故正确答案为A。
解析:本题考查be serious about sth的用法。B、C项介词搭配错误,D项缺少介词,故正确答案为A。
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