—Hello! May I speak to Tom, please?
—Yes, speaking.
—Oh, I______your voice at first.
| A．don’t recognize | B．didn’t recognize |
| C．hadn’t recognized | D．haven’t recognized |
（2013·新课标Ⅱ卷) It was only after he had read the papers Mr. Gross realized the task before him was extremely difficult to complete.
| A．when | B．that | C．which | D．What |
（2013·新课标Ⅱ卷) Only by increasing the number of doctors by 50 percent properly in this hospital.
| A．can be the patients | B．can the patients be treated |
| C．the patients can be treated | D．treated can be the patients |
The driver wanted to park his car near the roadside but was asked by the police ________.
| A．not to do | B．not to |
| C．not do | D．do not |
If ________ to look after luggage for someone else, inform the police at once.
| A．asked | B．to ask |
| C．asking | D．having asked |
The famous musician, as well as his students, ________ to perform at the opening ceremony of the 2012 Taipei Flower Expo.
| A．were invited | B．was invited |
| C．have been invited | D．has been invited |