16.It was about twelve o'clock------they finished the work.
A.since B.which C.that D.when
大约到了12点钟他们才完工.
固定句型:be about.when,只能填when
17.First of all,there must be a motivation as the driving-------to be willing to learn a foreign language.
首先,必须有一个诱因作为让人希望学一门外语的动力.
A.pull拉力 B.ability能力 C.pressure压力 D.force力量
driving force:动力