Question

You'd better have a try, ________ you'll lose such an opportunity．

1. A.
   however
2. B.
   therefore
3. C.
   otherwise
4. D.
   besides

Answer 1

C
句意为：你最好试一下，否则你将失去这么一个机会。otherwise否则，要不然；however可是，然而；therefore因此；besides除了……之外(还有)……。