—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 forB.will leave for；will leave forC.will leave for；leaves forD.leaves for；will leave for
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C解析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.