{01}Scientists say it may be one year or so ________ it is possible to test the new medicine on human patients.
A.when
B.after
C.before
D.since
解析:词义辨析。句意:科学家们说在有可能把这种新药用于人类前可能需要大约一年的时间。所以选C。 本题选C。 {02}The bus hit the huge stone by the road heavily _________ he could stop it. A.after B.before C since D.until 解析:这题考查连词的用法:before表示“还没来得及”,句意是:他还没来得及,公共汽车就撞上路边的大石头。选B。 本题选B。 {03}The government has taken some measures to reconstruct the earthquake-hit areas, but it must be some time ________ everything returns to normal.
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