请教大虾语法答案及改法和原因,求求你们啦

dengmi

改错真题:
The dicovery of the antibiotic penicillin in 1928 has not produced antibiotics useful  for the treatment of infectious diseases until 1940.

In every society there are norms that say individuals how they are supposed to behave.

Rice adapt better than other grain crops to areas with unfavorable saline,alkaline,or acid sulfate soils.

gre3333

b: --> had not produced 因为有until 1940这个过去的时间

b: --> tell 因为tell可以加这样的从句，say不可以

a: --> adapts

dengmi

还有一个问题,rice不可以做复数总称名词么?