2019年mpacc考试英语真题——连词37

{01}I didn’t make great progress in my English study _________ my teacher had given me some advice on how to learn the language well．
A.unless
B.before
C.until
D.when
解析：本题考查连词区别，when都不能与否定词连用，先排除；虽然unless和until都能与否定词连用，但unless常与将来时态连用，而until常与过去时或者将来完成时连用。
本题选C。
{02}He has difficulty with his English; ________, he works hard and is making rapid progress．
A.and
B.but
C.however
D.yet
解析：只有however后面可以用逗号和主句或分句分开。
本题选C。