C.has been working
D.worked
答案 A [考查时态。根据“by the end of last week”可知时间为过去的过去,故应用过去完成时。句意:到上周末为止,他已经在这家公司工作两年了。]
4.________ on ten years of observation and study,the theory shows that everyone dreams ever night,whether they realize it or not.
A.Basing
B.Based
C.Being based
D.Having based
答案 B [考查非谓语动词作状语。句意:基于十年的观察和研究,这项理论表明,每个人每晚都做梦,不管他们是否意识到这一点。the theory与base之间是被动关系,故用过去分词作状语。]
5.I'm sorry I can't help you with your English study ________,for I am busy with the meeting arrangement.
A.right away
B.right now
C.at once
D.straight away
答案 B [句意:对不起,我现在不能帮你学英语,因为我正忙着安排会议。right now“此刻;现在”;right away,at once,straight away都表示“马上;立刻”。]
6.Mother has not yet recovered from the serious illness,but her health is improving ________ day by day.
A.frequently
B.gradually
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