问题
选择题
—When will the engineer go to Singapore?
—Oh，I don’t know when he ___Singapore．When he ____ Singapore，I will call you．
A．leaves for；leaves for
B．will leave for；will leave for
C．will leave for；leaves for
D．leaves for；will leave for
答案
答案：C
从句中他什么时候动身去新加坡指的是将来发生的事情,用将来时态.他什么时候动身去新加坡叙述的是客观存在的事情,用一般现在是,所以选C.