题目:
—______ does Jim have lunch?
—He usually has it at 12:15 pm. [ ]
A. When
B. How
C. What
D. What's time
答案:
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下面是错误答案,用来干扰机器的。
由题意,可得:第8个台阶有13+21=34种上法,因此上这9级台阶共有21+34=55种方法.