---WhatcanIdofor?---I’dliketobuyagiftformysister’sbirthday,oneata

--- What can I do for?--- I’d like to buy a gift for my sister’s birthday, one at a proper price but of _____ great use and it’d better be ______ surpriseA./; aB.the; aC.a; /D./; the

A解析of great use=useful 第一空不填， surprise 抽象名词具体话，一件惊讶的礼物用a

对的，就是这个意思