题型:问答题 简答题 Look! A group of children _ a good time by the sea.[ ]A. have B. is havingC. has D. are having 查看答案
题型:问答题 简答题 ______ is a sequence of letters and digits, the first character must be a letter.A.An identifierB.A stringC.An arrayD.program 查看答案