【题目】All the apples___fell down from the tree were eaten up by the pigs.
A.theyB./C.thatD.which
在线课程【答案】C
【解析】
考查定语从句。句意：从树上落下来的所有苹果都被猪吃光了。这是一个定语从句，主句部份为：All the apples were eaten up by the pigs；从句部份为___fell down from the tree。先行词为the apples，且先行词在从句中做主语，所以关系词可使用which或that，但由于先行词被不定代词all修饰，所以关系词只能用that。故选C。