one choice question
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one choice question
he smoked with concentration.he concentrated _____it.
a.with b.on c.in d.for
he smoked with concentration.he concentrated _____it.
a.with b.on c.in d.for
![one choice question](/uploads/image/z/6903752-32-2.jpg?t=one+choice+question)
B
concentrate on something 集中做某事
固定搭配
concentrate on something 集中做某事
固定搭配