摘要：18．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
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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
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
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