英语选择题（定语从句）！！英语高手请进！！谢谢！5（1）

29.Among all the contestants, only Mary _____ had supposed could win the first prize.
A.who B. / C. I D. that-- 我选了B，答案选C

【这个句子有插入语：___ had supposed，而主干结构是 Mary could win ...，显然had supposed需要一个主语，那就是 I。意思：在所有的参赛者中，我估计只有玛丽能获得一等奖。】

30.Keep the drug _____ is out of children’s reach.
A. in a place where B.where C. in a place which D. in which--我选了B，答案选C

【___ is out of children's reach 缺少主语，而关系代词which能作主语，关系副词where能作状语，所以选C。意思：闷答请把那些药放在孩子们够不着的地方。】

31.The price of the food and vegetables _____ we had expected.
A. were a little lower than B.was cheaper than
C. was a little higher, as D.were higher, which--我选了B答案选了C

【句子想表达：像我们预计的一样，食物和蔬菜的价格有点高。所以需要 as we had expected】

32. He arrived in Shanghai in 2003, _____, some time later, he became a teacher.
A.when B. where C. that D. which--我选了A，答案选B

【从句已经有时间状语：some time later，所以不用when。____ he became a teacher缺少地点状语，所以用关系副词 where】

33. The challenge is to create a system, _____ the farmers can teach the world about plant medicine.
A.where B.which C.when D. for which--我选了B，答案选了A

【the farmers can teach the world 主谓宾成份齐全，所以不需要关系代词（蚂游慧代词作主语或宾语），只能填表示地点或方位的关系副磨源词where】