题目选项分析

broaden要和后面的feign平行，所以应该用broaden

C:
The hognose snake puts on an impressive bluff,
hissing and rearing back, broadening the flesh behind its head the way a cobra does and feigning repeated strikes, --> note the parallelism between these two parts: both are in the form '(verb)ING and (verb)ING'but it has no dangerous fangs and no venom, and eventually, if its pursuer is not cowered by the performance, will fall over and play dead. --> contains a key transition ('but'), and the start of a new clause (new subject & new verb), in just the right place - to mark the sudden transition/contrast between the stuff in the first half (all this intimidating behavior) and the stuff in the second half (it's all a big fake - snake oil, if you don't mind the pun).

最后一个分句“will”需要有主语

but 后面有强烈的意思转折，要写成一个从句来强调

并列最后一个要加and

连词but and 后面跟完整句子

broadens和puts平行了，语意错误；but后面跟完整句子