{01}Hi, Bob. How are you doing? It has been a long time _____ we left our junior middle school.
A.when
B.that
C.before
D.since
解析: 试题分析:此处主句是现在完成时,从句是一般过去时,所以选since。句意:Bob你过得怎么样?自从我们初中毕业很长时间了。 本题选D。 {02}It is uncertain side effect the medicine will bring about , though about one thousand patients have taken it.
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