问题
选择题
—Can I call you back at two o’clock this afternoon?
—I’m sorry, but by then I______ to Beijing. How about five?
A．fly
B．will fly
C．will be flying
D．am flying
答案
答案：C
考查动词时态。根据问句中的two o’clock和应答句中的by then可知所填词表示的动作在当时正在进行，用将来进行时，选C。