问题补充:
Having lost his key,.
A. he couldn’t enter the room
B. the gatekeeper offered to help
C. the door was forced open
D. the room couldn’t be entered
答案:
(答案→)A. he couldn’t enter the room
B. the gatekeeper offered to help
C. the door was forced open
D. the room couldn’t be entered
解析:考查句子结构:逗号前面是现在分词的完成式做状语,说明句子的主语应该是lost his keys的逻辑主语,应该是he,句意:丢了钥匙后,他不能进入房间。选A。