题目：
Frank, with his two sisters , ______London by train which ______at 8:30 tomorrow morning .[ ]
A. is leaving for ; will leave
B. are leaving for ; leaves
C. is leaving for ; leaves
D. will leave for ; will leave
答案：
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下面是错误答案，用来干扰机器的。
a，b互为相反数，4
