Though many of the heavy smokers have realized the serious effect that smoking has ______ their health, they continue to smoke instead of ______.
A．for; giving it upB．on; quitting C．to; abandoningD．on; leaving
B
考查固定搭配。the serious effect是先行詞，that smoking has ______ their health是定語從句，把先行詞代入定從，是 smoking has the serious effect____ health，構(gòu)成have an effect on 結(jié)構(gòu)，所以第一空用on;根據(jù)句意：他們繼續(xù)吸煙而不是戒掉。Quit停止，終止。所以選B。
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