故排除A、D。
答案:B 4.Although the causes of cancer________,we do not yet have
any practical way to prevent it.
A.are being uncovered
B.have been uncovering
C.are uncovering
D.have uncovered
解析:因为句子的主语the causes of cancer与谓语uncover
是被动关系,因此我们使用被动结构,只有A 符合这一条
件。
答案:A 5.By the end of last year,another new gymnasium________in
Beijing.
A.would be completed
B.was being completed
C.has been completed
D.had been completed
解析:by意为“到……为止”。by后加过去时间,主句用过去
完成时,如by后加现在时间,用现在完成时,如by后加将来
时,主句要用将来完成时。by the end of last year常与过
去完成时连用。表示到过去某个时候前已完成的动作。
答案:D 6.When and where to go for the onsalaryholiday ______ yet.
A.are not decided
B.have not been decided
C.is not being decided
D.has not been decided
解析:根据副词yet可确定用现在完成时,可排除A、C;
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