5．Keep working hard，       all your efforts these years will be wasted．（　　）
A．andB．butC．soD．or

分析 堅持努力，否則你這些年所有的努力都會白費．

解答 答案是D，本題考查并列連詞的特殊句式．本題中含有特殊句式："祈使句+and/or+一般將來時的句子"=If引導的條件句+主句．or 表示與上文的相反的情況；本句=If you don't work hard，all your efforts these years will be wasted．故D正確．

點評 首先要理解連詞的功能：并列連詞連接并列的詞、短語或句子；從屬連詞連接主從句；其次理解各連詞含義；最后結(jié)合語境做出判斷．

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