The parents are their son who has been away from home for days.A. in search ofB. to searc

问题补充：

The parents are their son who has been away from home for days.

A. in search of

B. to search

C. searching

D. searched for

答案：

(答案→)A. in search of

B. to search

C. searching

D. searched for

解析：考查句子结构。句意：这对父母正在寻找他们已经离家几天的儿子。不定式表示具体的将要进行的动作，选项B不符语义。Search表示寻找某物后面一般要加介词，根据语境可知本句也不是被动语态，故用短语in search of，选A。