He is not here,He _____ aboard on business A.has been B.has been to C.has gone D.has gone to
问题描述：
He is not here,He _____ aboard on business A.has been B.has been to C.has gone D.has gone to
答
C.has gone
aboard是副词,后面不用再加TO;
has been是曾去过,已经回来.
原句是说: 他不在这儿,他出国出差了.
显然是离开了,
has gone,表示离开,或在途中.