一道英语题（非谓语动词）
Ithasbecomeamustforhim——onthecomputerandsurftheInterneteverymorning.A.toturnB.turning...
It has become a must for him ——onthe computer and surf the Internet every morning. A.to turn B.turning C.to have turned D.having turned 问题补充： 求教A与B怎么区别啊，doing不行吗
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