题干
The boss praised the young man for his hard work, though he ____ experience.
A：was lack of
B：was lacking in
C：lacks of
D：was lacking of
答案(点此获取答案解析）
B
A：was lack of
B：was lacking in
C：lacks of
D：was lacking of
的圆心角与圆弧围成的扇形面积为（ ）
