第二部分英语知识运用（共两节，满分45分）
第一节：单项填空（共15小题；每小题1分,满分15分）
从 A、B、C、D 四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
21．— We could invite Barbara to the barbeque this Saturday．
— Yes, ______
A．that's all right． B．why not? C．I wonder． D．why?
It was until dark ___ he found ___ he thought was the correct way to solve the problem.
| A．that; what | B．that; that | C．when; what | D．when; that |
It was in the evening__we reached the littletown of Winchester.
A that B. untilC. sinceD. before
.It was ____ my teacher worked ____ I work hard.
| A．where; that | B．where； where | C．that; that | D．that ;where |
It is the young man ___ looked for ___ caught the murderer.
A.that; who B.that; theyC. they ;thatD they ;which
It is on a winter night ___he spent with me last night.
| A．that | B．where | C．as | D．when |