---Do you still smoke heavily?       
--- No. In fact, it is two years since I ____.  
A. have stopped smoking               B. smoked   
D. began to smoke                    D. started to smoke
B
考查since結(jié)構(gòu)。it is two years since I ____。ince后面跟延續(xù)性動詞，表示在動詞動作結(jié)束后已經(jīng)兩年了。即我不吸煙已經(jīng)兩年了，吸煙這一動作發(fā)生在過去，所以用一般過去時態(tài)。選B。
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