1．_____, Carolina couldn't get the door open.
A．Try as she might B．As she might try
C．She might as try D．Might she as try
解析：
“动词原形+as+主语 + 情态动词”是“although +主语+谓语”的倒装形式，原句可写为Although she might try, …
答案：A
2．In the dark forests ________, some large enough to hold several English towns.
A．stand many lakes B．lie many lakes
C．many lakes lie D．many lakes stand
解析：
stand意为“矗立着”，lie意为“存在”，在森林中有湖。不用stand因而排除A、D两项。B答案是倒装句。英语中为了强调而将表示地点的介词短语放在句首，主谓语采用完全倒装形式。又如：
On the top of the building flies a red flag. 楼顶上飘扬着一面红旗。
答案：B
3．—Tom is never late for work. Why is he absent today?
—Something ________ to him.
A．must happen B．should have happened
C．could have happened D．must have happened
解析：
should have done意为“本该做某事，但是没有做”；could have done意为“可能做某事”；must have done意为“一定做了某事”，对过去发生事情的肯定推测。句意为：
—汤姆从不迟到，今天怎么没来？
—他肯定发生了什么事情。
答案：D
