A.as | B.that | C.during | D.if |
A.or else | B.or rather | C.rather than | D.other than |
A.though | B.yet | C.however | D.although |
A.however | B.besides | C.though | D.therefore (表示一种因果关系) |
A.while | B.the moment | C.until | D.before |
A.because | B.but | C.though | D.while |
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