1：The__expression on his face suggested he was at wh

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1：The______expression on his face suggested he was ____at what he
had seen.
A.boring;bored B.puzzled;puzzled
C.surpring;surprised
D.disappointing;disappointing
请说一下选B的理由,以及不选其他3个的理由...
2：By the time he finishes his research ,he ___on this project
for almost ten years.
A.will work B.has been working
C.has worked D.will have been working
请说一下选D的理由，以及不选其他3个的理由。..

希望以下答案对你有一定帮助.
1.本题关键是理解bore,puzzle,surprise,disappoint一类词的ing形式和ed形式的含义.ing形式表示“令人……的”,是别人的感受；ed形式表示“……的”,是自己的感受.
如果选A,那么意思是“他脸上令人感到无聊的表情暗示着他对于他所看到的觉得无聊”.可是一个人脸上的表情能令人感到无聊吗?A应该改为bored,bored.选B是因为前面一个空表示他脸上困惑的表情,后面一个空是固定搭配be puzzled at sth.,如果选C,这里惊讶的人应该是他自己吧,所以第一个空应该改为surprised,如果选D,第一个空应该改为disappointed.
2.B 解析：本题考查现在完成进行时态的使用方法.句意为：当他完成调查时,他已经在这个工程上忙碌了大约10年了.表示他一直在忙这件事,过去在忙,现在也在忙,将来还可能忙.B是典型的现在完成进行时态,所以选B.

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