单选题 To my surprise, he made a ______ boat by himself.
  • A.sixteen-meters-long
  • B.long sixteen-meter
  • C.sixteen-meter-long
  • D.sixteen meter long
【正确答案】 C
【答案解析】[解析] 基数词+单位名词单数+形容词作定语，因此选C。