题目列表(包括答案和解析)
.You'd better get the problem solved as soon as possible ______ it becomes out of control.
A.when B.before C.since D.unless
She stopped she might have succeeded next time.
A.when B.as C.since D.unless
They have a meeting every Monday, ________ there is nothing to discuss.
[ ]
_______ the house is empty, memories flood my mind of a time when it was filled with life.
A.Since B.Unless C.As if D.Even though
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