問題補充：
單選題
He ___ go to work by bus, but now he ___ riding a bicycle to work.A.used to; used toB.used to; is used toC.is used to; used toD.is used to; is used to
網(wǎng)友答案：
熱心網(wǎng)友 1樓
B解析這里是考used to和is used to的用法。這里表示一種對比關(guān)系，以前是那樣，現(xiàn)在不是那樣了。
