单选题 The salesman approached the house cautiously because of the vicious dog.
  • A. nervously
  • B. bravely
  • C. carefully
  • D. deliberately


【正确答案】 C
【答案解析】cautiously意为“小心谨慎地”，C项carefully与其同义，故C是正确答案。其他三个选项的意思分别是“紧张地”、“勇敢地”、“故意地”。