Have you heard of a dinosaur _____ feathers? A. covered with B. covered by 答案为什么是A, B为什么

Have you heard of a dinosaur _____ feathers? A. covered with B. covered by 答案为什么是A, B为什么不行呢？

be covered with 是固定短语：被……覆盖
句意是：你听说过恐龙浑身都是羽毛吗？

祝你开心。

因为这里cover是覆盖的意思，所以要和with连用，这是固定搭配。如果是和by连用，是指负担费用这个意思，比如the expenses are coverd by the state.

there is going to be 属于 there be句型，本身就有“有”的意思，另外没有主语人或动物，不能用have