2019年mpacc考试英语真题——连词1254

{01}How many more decades will have to pass ____ scientists succeed in providing a cure for cancer?

A.when

B.since

C.before

D.until

解析：略
本题选C。
{02}The last letter ____ arrived yesterday morning left him______ very sad.

A.which; feel

B.which; to feel

C.that; feeling

D./; felt

解析：略
本题选C。
{03}Most parents still hold the view______students should first put their hearts into their lessons.

A.how

B.what

C.why

D.that

解析：略
本题选D。