one choice questionhe smoked with concentration.he concentrated _____it.a.with b.on c.in d.for

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one choice questionhe smoked with concentration.he concentrated _____it.a.with b.on c.in d.for

one choice questionhe smoked with concentration.he concentrated _____it.a.with b.on c.in d.for
one choice question
he smoked with concentration.he concentrated _____it.
a.with b.on c.in d.for

one choice questionhe smoked with concentration.he concentrated _____it.a.with b.on c.in d.for
B
concentrate on something 集中做某事
固定搭配

concentrate on sth.

b.on

b

B