2019年mpacc考试英语真题——连词336

{01}As the sea ice melts sooner each swimmer,polar bears are forced to come ashore earlier and face food shortages _____ they have stored enough fat to last them through the season.
A.before
B.unless
C.since
D.until
解析：
本题选A。

{02}I grew up in Africa. _____ at least I should say that I spent much of the first ten years of my life there.
[     ]  
A.And
B.Or
C.So
D.But
解析：
本题选B。