_______, her hands shook constantly and violently.
| A．Knowing her son killed in the mine | B．When she knew her son was killed in the mine |
| C．Known her son killed in the mine | D．She knew her son killed in the mine |
— Oh, fantastic! What is your comment on the song Jingubang?
— Terribly sorry! I _____.
| A．didn’t listen | B．wasn’t listening |
| C．haven’t listened | D．hadn’t listened |
______ your teacher the problem with learning, theoretically, and they will help you.
| A．Telling | B．To tell | C．Tell | D．Having told |
—What if he failed in the next monthly examination again?
— I don’t know. ______ heart and be reduced _____ the class?
| A．Will he lose; not to attending | B．Did he lose; to not attending |
| C．Had he lost; not to attending | D．Would he lose; to not attending |
Rather than sticking to the principles stubbornly, China is now adopting a new concept in economic policies in a/an _______way that shows its own characteristics.
| A．sustainable | B．flexible | C．invisible | D．available |
The keeper of the spring cleared away the leaves and branches, and wiped away the silt(淤泥) that would _______ have choked and polluted the fresh flow of water.
| A．thus | B．otherwise | C．therefore | D．later |