難度：★    考點(diǎn)：介詞的使用

　　1. Bill has made great progress _____________the help of his teachers.

　　A. for           B. with         C. under

　　2. Her mother goes to work ______    bus every morning.

　　A. by             B. at                         C. on                  D. in

　　3. Linda is not good at Chinese, but she passed the exam ______ the help of her classmates.

　　A. with              B. under              C. without

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