问题
选择题
—— Is Tom still smoking ?
—— No.By next Saturday he ＿＿＿＿＿＿＿ for a whole month without smoking a single cigarette.
A．will go
B．will have gone
C．will have been
D．has been going
答案
答案：B
by 后跟将来的时间状语时，主句要用将来完成时。go without 意为“在缺……的情况下对付”。