評論
打印
647.Something must be done to prevent our city _____ by thick smoke.
A.to be polluted
B.from polluting
C.from being polluted
D.polluting
648._______ the obvious differences in size and population,the states of America have many things ________ common.
A.Although;on
B.Though;in
C.In spite of;in
D.Because of;on
