这个to是介词还是不定式符号

　　【题目】

　　We are looking forward to ________ from Mary.

　　A. hear                        B. hearing                        C. heard                        D. have heard

　　【分析】

　　此题应选B。容易误选A，认为其前的to是不定式符号。

　　to有时是不定式符号，有时是介词。用作介词时，注意以下常见搭配：

　　look forward to 盼望

　　devote……to 致力于，献身于

　　pay attention to 注意 stick to 坚持

　　be used to 习惯于(但used to表示过去经常，to为不定式符号；be used to 表示“被用来……”时，to 也是不定式符号)

　　on the way to 即将成为 (但表示“在做某事的路上”时to是不定式符号)

　　【类似】

　　1. He was devoted¹ to _________ the poor.

　　A. help                         B. helping²                     C. helped                      D. being helped

　　2. The weather was cold，but soon he got used to

　　_________ there.

　　A. live                          B. living                        C. lived                         D. having lived

　　3. You should pay more attention to __________ with

　　those who differ with you.

　　A. unite and work          B. uniting and working    C. unite and working     D. uniting and work

　　4. She was on her way to __________ her daughter.

　　A. see                           B. seeing                        C. saw                        D. have seen

　　5. He was on the way to __________ an engineer.

　　A. become                    B. becoming                    C. became                   D. be

　　答案：1. B 2. B 3. B 4. A 5. B

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