【题目】Mark has come in his raincoat and boots, _____ for rain.
A.preparing
B.prepared
C.to prepare
D.prepares

【答案】B
【解析】本句中考查的动词prepare的过去分词转换的固定搭配be prepared for..为…做好准备；如果选择A项，后面就不应该有介词for的搭配，因为prepare是一个及物动词。句意：他穿着雨衣和靴子进来了，已经为下雨做好了准备。故B正确。