荆轲最强输出出装2017:Jim's sister was badly ill , so he had to ------ his home at once.

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A. arrived in B. set off C.leave for D. go back 请选择并说明

答案是C 啦,他必须立刻离开回家去。
have to do something,所以,to 后面跟的动词应该是原型;
如果选择 go back,应该是go back home, home 前不应该有his作修饰。
set off 按常理也说不通嘛!!!

B
AC 都是到达的意思
D 是返回的意思
B 是离开的意思
吉姆的姐姐的了重病 所以他要马上离开家(当然是去照顾姐姐了)