【题目】Don’t be angry any more. I’m sure he ignored you by accident and not ________.
A. by chance B. by design C. by mistake D. by force
在线课程【答案】B
【解析】考查介词短语。句意：别再生气了，我肯定他忽视你是偶然的而且不是故意的。A. by chance偶然；B. by design故意；C. by mistake错误地；D. by force被迫。根据第一句Don’t be angry any more.以及前面的Not可推知，这里表示“故意的”，故选B。