动词的时态和语态
1．—What's that terrible noise，David?
—Oh，I forgot to tell you.The new machines in the nearby plant________ .
A．were tested B．will be tested
C．are being tested D．have been tested
解析：考查动词的时态。根据问句中的What's that terrible noise 可知，这里应该用进行时态，噪音是机器正在被检测时发出的，所以用现在进行时的被动语态。
答案：C
2．The attackers were arrested and didn't know where they________ .
A．would take B．are taken
C．were being taken D．will be taken
解析：句意为：袭击者被捕了，他们不知道正被带往何处。根据didn't know 可知，空格处也应该用过去的某种时态，所以B、D不正确；根据句意可知此处用被动语态，故选C。
答案：C
3．When I got on the bus, I________ I had left my wallet at home.
A．was realizing B．realized
C．have realized D．would realize
解析：考查动词时态。句意：当我上了公共汽车的时候，我意识到我把钱包忘在家里了。题干在陈述
