精选优质文档-倾情为你奉上省略专项练习1. When first _ to the market, these products enjoyed great success.A. introducing B. introduced C. introduce D. being introduced2. It shames me to say it, but I told a lie when _ at the meeting by my boss.A. questioning B. having questioned C. questioned D. to be questioned3. The man we followed suddenly stopped and looked as if _ whether he was going in the right direction. A. seeing B. having seen C. to have seen D. to see4. Generally s
