He is the only one of the students who _________ a winner of scholarship for 3 years.
| A．is | B．are | C．have been | D．has been |
The river ____are covered with trees is very long
| A．which banks | B．of which banks |
| C．whose the banks | D．the banks of which |
----I missed the first part of the film. It was really a pity．
----You _____home half an hour earlier.
| A．should have left | B．must have left |
| C．should leave | D．must leave |
It was at the very beginning____ Mr. Smith made a decision ___we should send for a doctor．
| A．what，that | B．that，which | C．which，that | D．that，that |
A brilliant idea occurred to him, ___ to his research in the lab.
| A．while devoting | B．while devoting himself |
| C．while he was devoted | D．while devoted |
He started early _______he could get there before nine
| A．in order that | B．because | C．so as to | D．in order to |