单选题 The building owner has ______ its list of potential contractors to those whose bids are within his limited budget.
A. chosen for
B. assumed as
C. applied to
D. narrowed down

【正确答案】 D

【答案解析】高级问题中要表达的意思是“缩小范围”，因此正确答案是narrow down。choose A from B有“选择”的意思，虽然看起来像正确答案，但因为没有宾语所以不能选。assume意为“承担”；apply to意为“适用于”。
[高频词语] potential 潜在(的) bid 投标