2019年mpacc考试英语真题——连词1040

{01}It was not until 1920 ______ regular radio broadcasts began.

A.while

B.which

C.that

D.since

解析：略
本题选C。
{02}Do ________ you think is right _________ difficulties you may have.

A.what; however	B.that; whatever
C.whatever; however	D.what; whatever

解析：略
本题选D。
{03}Write clearly ____ your teacher can understand .you correctly.

A.since

B.for

C.because

D.so that

解析：略
本题选D。