問題補(bǔ)充：
單選題
There _______ many people _______ in the office, but now nobody is allowed to．A.used to be；smokingB.used to have；smokingC.used to be；smokeD.used to have；smoke
網(wǎng)友答案：
熱心網(wǎng)友 1樓
A解析“過去曾經(jīng)有……”用“There used to be…”表示“有人干某事”用“There be someone doing sth．”表示。故選A。
