(1)單項選擇

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

過馬路時一定要遵守交通規(guī)則。

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

答案：
解析：

解答：(1)D;(2)When crossing，follow


提示：

名師導(dǎo)引：題1中once begun等同于once the research is begun；題2中過馬路用when +crossing作狀語；follow表“遵守”。


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