问题补充：
It is certain that he willhis business to his son when he gets old.
A. take over
B. think over
C. hand over
D. go over
答案：
A. take over
B. think over
(答案→)C. hand over
D. go over
解析：该题的题意为:确定无疑的是他老了以后要把企业交给儿子。给出的四个短语的意思是:take over 接受，接管；think over 仔细考虑； hand over 移交，交出；go over 复习。
