题目内容
Every possible means _____ to prevent the air pollution, but the sky is still not clear.
| A．is used | B．are used | C．has been used | D．have been used |
C
解析试题分析： 考察主谓一致。本题主语中的名词means是一个单复数同形的名词，要在具体语境中判断是单数还是复数。本句中的形容词every后面通常要节单数名词，故使用AC，根据句义说明这是已经发生的事情，故使用现在完成时。句义：每一种可能的方法都已经被使用来预防空气污染，但是天空仍然不晴朗。故C正确。
考点：考察主谓一致
Twenty of the students will have sports, the rest ___ studying here
| A．are | B．is | C．were | D．was |
Still many Senior Three students haven't realized reading English newspapers _______of great help to their English study.
| A．is | B．are | C．have been | D．had heen |
One third of our school _________ covered by trees, while the majority of our students ________ girls.
| A．is, is | B．are; are | C．is; are | D．are; is |
______visited the Shanghai World Expo is sure to tell you the place is worth visiting twice.
| A．Those who have | B．Whoever has |
| C．Those who has | D．Whoever have |
Riding on the swings and playing with the ducks in the pond _____ our children’s greatest pleasures when we took them to the park.
| A．is | B．were | C．was | D．are |
With all my attention _______ my homework, I didn’t even notice my father standing by me.
| A．to fix on | B．fixed on |
| C．fixing on | D．to be fixed on |