Many provinces have been hit with smog. If _______ unsolved, the problem may lead to more serious results.
| A．having left | B．to leave | C．left | D．leaving |
--- I got upset yesterday just because you didn’t hand in your homework on time.
--- Terribly sorry. Ten more minutes, I_____it to you.
| A．would have taken | B．would take | C．had taken | D．must have taken |
--- What about the services in this hotel?
--- They are at least as good as, if not_____, those in yours.
| A．superior than | B．superior to |
| C．more superior to | D．more superior than |
I’ve never seen anyone perform so beautifully －__________ Tasso play.
| A．just watch | B．just to watch | C．just watching | D．just having watched |
The song Legend by Wang Fei on CCTV 2010 gala, _______young Chinese audiences.
| A．attaches to | B．attends to | C．keeps to | D．caters to |
Li Lei has not yet answered my question______I can go with him to________he calls the Natural Underground Gallery next week.
| A．that; which | B．whether; what | C．whether; that | D．that; where |