oil rigs have to be repaired frequently and divers,who often have to work in darkness a hundred feet under water,have be
问题描述：
oil rigs have to be repaired frequently and divers,who often have to work in darkness a hundred feet under water,have been frightened out of their wits by giant fish bumping into them as they work.这里的bumping into为什么要用ing形式呢?而且have been frightened out of their wits这里为什么要用现在完成时态呢
答
bumping into them as they work 做fish的ing形式的定语.
divers ..have been frightened out of...潜水员们被那些巨型大鱼吓的六神无主.是过去发生的事情,且对现在的观点陈述有影响,所以用 现在完成时态.