Question

_________ or you will fail; _________ would be the situation you face．

1. A.
   Try hard; so
2. B.
   Don’t lose heart; which
3. C.
   Go all out; such
4. D.
   Keep up your courage; as

Answer 1

C
从第一空判断各选项均对，中间标点是分号，所以第二句不是定语从句，B、D选项错，so是连词，不能充当主语，such是代词，可作主语。