Many people claim that they have seen UFO with their own eyes, _____ I personally doubt.
A．that
B．which
C．when
D．where
答案：B
定语从句考查题。先行词为整个主句所以关系词只能用which而且关系词在从句中作宾语。 句意：许多人声称他们看到了UFO我对此表示怀疑。
| 根据下面提供的对话情景，从下列7个选项中选择正确答案，使对话连贯、完整。请将答案代号写在题后的横线上，其中有两项是多余的。 | |
| A:Today we are going to talk about a great invention. It looks like a human being. 1 B:It's a robot. 2 A:Of course not. The first robot was invented in 1921. B: 3 A:Sure. They can take the place of humans to do some boring work. They can also do a lot of dangerous work instead of humans. B: 4 A:No. Robots can do a lot of work instead of people in many ways, but people wouldn't be replaced by robots. 5 B:We get it.
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