问题补充:
---You aren’t looking well. Anything the matter?
---I’ve been surfing the net too long. I’m a bit tired.I can hold on,.
A. though
B. yet
C. besides
D. therefore
答案:
(答案→)A. though
B. yet
C. besides
D. therefore
解析:句意:--你看起来不是很好,怎么了?--我已经上网太久。我太累了,不过我能坚持。Though可是,然而;yet用于否定句和疑问句中及用于表示怀疑的动词之后,意思是“还,尚,仍然,直至现在”; besides此外,而且;therefore因此。根据句意故选A。