The number of the employees has grown from 1,000 to 1,200.This means it has risen ________ 20 percent.
| A．at | B．by | C．to | D．with |
. An awful accident ________, however, occur on the express the other day.
| A．does | B．did | C．has | D．had |
. Was it ________ your son won the first prize last month that please you?
| A．who | B．that | C．what | D．which |
强调、倒装与省略（句）
. It was ________ he studied that he managed to receive a doctor’s degree.
| A．that | B．because | C．on account of | D．due to |
.Growing around the river ________ wild flowers of almost the same colour.
| A．is | B．was | C．are | D．has been |
. A variety of courses ________ offered to enrich the students’ background knowledge of the English-speaking countries.
| A．were | B．is | C．have | D．has E) / |