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
考查“祈使句＋and/or＋陳述句”。因?yàn)槠硎咕渑c后面的陳述句所表達(dá)的內(nèi)容是對(duì)立的關(guān)系，故用or(否則)。
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