典型易错题归类分析

下面这道题是考查非谓语动词、状语从句还是祈使句？

_______ your composition carefully, some spelling mistakes can be avoided.

A. Having checked                        B. Check          

C. If you check                            D. To check

【陷阱】几个干扰项均有可能误选，尤其可能误选A(from www.nmet168.com)。

【分析】最佳答案选 C。前面一个分句为条件状语从句，后面一个分句为主语。现分析几个干扰项：选项 A 和 D 均为非谓语动词，根据英语语法习惯，非谓语动词作状语时，其逻辑主语应与句子主语一致，而此句的 some spelling mistakes 显然不能用作 having checked 或 to check 的逻辑主语，故不能选为答案；若选 B，则两个句子之间缺少必要的连词，也不对。请做类似试题(答案均选 C)：

(1) ________ more careful, the work might have been done better.

A. Being                                      B. Having been

C. If you had been                        D. To have been

(2) _______ your diet, it is easy to reduce.

A. Watching                                B. To be watching

C. If you watch                           D. To have watched

(3) _______ a pair of compasses, it is easy to describe a circle.

A. Having                                   B. To have had

C. If you have                             D. if having

(4) _______ for something, a receipt is given to you.

A. Paying                                    B. Having paid

C. When you have paid                 D. To be paying

(5) _______ the sun rising slowly in the east, the scene is a perfect dream.

A. Seeing                                    B. To be seeing

C. When you see                         D. Having seen