—How did she get infected?
—She _______ the viruses without any protection．
| A．exposed to | B．had exposed to |
| C．was exposed to | D．been exposed to |
With a lot of difficult problems ____, the manager felt worried all the time.
| A．settled | B．to be settled | C．settling | D．to settle |
As we all know, it was _____ that resulted in the terrible car accident.
| A．because of her carelessness | B．her being careless |
| C．because she was careless | D．she was so careless |
With online course Crazy English has over 20 million students all over China the class through the Internet .
| A．attend | B．attended | C．attending | D．to be attending |
The bank is reported in the local newspaper in broad daylight yesterday.
| A．being robbed | B．to have been robbed |
| C．robbed | D．having been robbed |
At the computer operation test, one is supposed to stay at his own machine, keep his eyes on his screen, ______ to anyone.
| A．and not to speak | B．but could not speak |
| C．instead of speaking | D．or rather speak |