I work harder at my lessons this year _____ I have made good progress.
A．butB．orC．a(chǎn)ndD．for
C

試題分析：句意:今年我更加努力的學習我的功課，所以我取得了很大的進步。but 但是，表示轉(zhuǎn)折；or 或者，否則；and 和，表示連接或結(jié)果；for 是一個介詞，后面不能跟從句。根據(jù)句意可知選C。
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