The flu is believed ________ by viruses that like to reproduce in the cell insid
题型：不详难度：来源：
The flu is believed ________ by viruses that like to reproduce in the cell inside the human nose and throat.| A．causing | B．being caused | | C．to be caused | D．to have caused |
|
答案
| C |
解析
| 在“sb/sth is/was＋过去分词＋不定式”句型中，如果不定式所表示的动作在谓语动词后面发生，动词不定式要用一般式。 |
举一反三
________ the meeting himself gave them a great deal of encouragement.| A．The president will attend | | B．The president to attend | | C．The president attended | | D．The president"s attending |
|
—They are quiet，aren"t they?
—Yes.They are accustomed ________ at meals.| A．to talk | B．to not talk | | C．to talking | D．to not talking |
|
The news of ________ greatly made us surprised a lot as he was indeed very excellent.| A．not his having elected | B．not his being elected | | C．his not being elected | D．his not having elected |
|
________ the program，they have to stay there for another two weeks.| A．Not completing | B．Not completed | | C．Not having completed | D．Having not completed |
|
The country has already sent up three unmanned spacecraft，the most recent ________ at the end of last March.| A．has been launched | B．having been launched | | C．being launched | D．to be launched |
|
最新试题
热门考点