问题
选择题
.
--- 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 ______ surprise.
A．/; a
B．the; a
C．a; /
D．/; the
答案
答案：A
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