单选题 To get a necessary reference letter for the scholarship, students must contact ______ high schools in advance.
  • (A) they
  • (B) them
  • (C) their
  • (D) theirs


【正确答案】 C
【答案解析】名词的前面可填入所有格。这里填入的所有格是形容词性物主代词。其他选项都是代词或名词性物主代词。