单选题 Some designers prefer to work on ______ because they concentrate well without distractions caused by others.
  • A. they
  • B. their
  • C. their own
  • D. themselves
【正确答案】 C
【答案解析】[解析] 语法：代词 1．on one's own意为“独自地、主动地”，因此C为正确选项。 2．on one's own=alone=by oneself，三者通用。