Question

It is bad manners to ________an invitation without a reason.

A．break down

B．settle down

C．turn down

D．calm down

Answer 1

C

解析试题分析：考查短语动词词义辨识。题意：无故拒绝邀请是不礼貌的。break down：（机械）抛锚；（人的精神）垮掉；settle down：定居；turn down：拒绝；calm down：冷静下来。故C项正确。
考点：短语动词。