Generally speaking, prices of daily goods ______ through the Internet are lower than store prices．
| A．to buy | B．are bought | C．buying | D．bought |
. From this simple concept ________ that has caused a great change in farming.
| A．has developed a technique | B．has a technique developed |
| C．a technique has developed | D．developed as a technique has |
. ________ when she started complaining.
| A．Not until arrived he | B．No sooner had he arrived |
| C．Hardly did he arrive | D．Scarcely had he arrived |
. 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 |