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(1)单项选择

The research is so designed that once ________ nothing can be done to change it.

[  ]

A.begins
B.having begun
C.beginning
D.begun

(2)完成下面句子

过马路时一定要遵守交通规则。

________ the street, be sure to ________ the traffic rules.

答案:
解析:

解答:(1)D;(2)When crossingfollow


提示:

名师导引:题1once begun等同于once the research is begun;题2中过马路用when +crossing作状语;follow表“遵守”。


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