The researchers are more and more ______ the environmental pollution.( )(本题1.0分) A、 involved in B、 concerned C、 conducted D、 dealt with

The researchers are more and more ______ the environmental pollution.( )(本题1.0分)
A、 involved in
B、 concerned
C、 conducted
D、 dealt with

出自：许昌大学-大学英语4

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