D.begun
解析:考查过去分词补充成条件状语从句的用法。句子应为once (the research is) begun。
答案:D
高 效 作 业
自我测评·技能备考
Ⅰ.单词拼写
1.The snow is very ______() and there is a lot of air in it.
2.His life is _________() given up to work.
3.The ___________() rises and the play begins.
4.That's __________() what I expected.
5.To send me to college, my parents _________() a lot.
6.Our workmate has been in danger. We're all
c_____________ about his health.
loose
entirely
curtain
exactly
suffered
concerned
7.They come from Germany. They are G____________.
8.On hot summer nights, people like to sit
o____________, chatting and enjoying the cool air.
9.I'm g ________________ for
your help.
10.Their age is from 13 to 19. They are called
t_________________.
Germans
outdoors
grateful
teenagers
1.—My children are always arguing.
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