题目：A．become concerned aboutB．become concerned withC．become concerned inD．concern
A．become concerned about
B．become concerned with
C．become concerned in
D．concern
be concerned about：担心，挂念，担忧。如：We are rather concerned about mother's health．我们相当担心母亲的健康。be concerned in sth．和某事有牵连；be concerned with与……相关，参与。