1. He’ll never succeed in passing the CET6, ______ hard he tries.
A. however B. whatever C. despite D. though
【答案】A
【解析】在引导让步状语从句时，以上四个选项只有however(此处与 no matter how 同义) 后可以接副词。本句中hard 为副词，意为“努力地”。
2. Her face is ______ to me, but I can’t remember where I saw her.
A. similar B. friendly C. alike D. familiar
【答案】D
【解析】similar：相同的，相似的;friendly：友好的，亲切的;alike：相似的(地)，相像的(地); familiar：熟悉的，可构成短语 sb. be familiar with sth. 或sth. be familiar to sb.，二者搭配不同，但意义相近。
3. ______ , water resources have been severely wasted or polluted.
A. They are scarce B. Scarce they are
C. Scarce as they are D. As scarce they are
【答案】C
【解析】as引导让步状语从句时要用倒装结构。
4. ______ from space, our earth, with water covering 70% of its surface, appears as a “blue planet”.
A. Seen B. Seeing C. To be seen D. Having seen
【答案】A
【解析】本题考查过去分词的用法。因动作的逻辑主语(earth)与动作(see)之间为动宾关系, 应使用过去分词短语做条件状语。
5. —Are you going downtown this afternoon?
—I am going to have these letters ______ .
A. mailed B. mail C. to mail D. mailing
【答案】A
【解析】have sth. done 为固定搭配，使役用法，宾语是过去分词所表示的动作的承受对象，隐含的是动作的执行者。
6. ______, everything would have been all right.
A. He had been here B. Been here he had
C. Here he had been D. Had he been here
【答案】D
【解析】本题考查非真实条件句的倒装用法。在含有由if 引导的非真实条件句的虚拟语气句型中，if 可以省略，但要用倒装结构。