问题
选择题
You have failed two tests.You'd better start working harder, ________you won't pass the course.
A．and
B．so
C．but
D．or
答案
答案：D
考查“祈使句＋and/or＋陈述句”。因为祈使句与后面的陈述句所表达的内容是对立的关系，故用or(否则)。
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