You have failed two tests.You’d better start working harder,_______ you won’t pass the course.
A．a(chǎn)ndB．soC．butD．or
D
or作并列連詞,意為“否則,要不然”。根據(jù)句意可判斷出表示“你最好開始更加努力工作,否則你將通不過這門課程”。故選D項(xiàng)。and意為“及,和,與,同，又,兼”,表示并列或?qū)ΨQ關(guān)系。so 作并列連詞,意為“因而,所以,那么,這樣看來(lái)”。but作并列連詞,可以連接兩個(gè)并列成分或兩個(gè)并列分句,意為“但是,然而”。
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