２．It was not until 1920 ______ regular radio broadcasts began.
2024-01-15St高級語法
２．It was not until 1920 ______ regular radio broadcasts began.
A.while
B.B .which
C.C .that
D.since
正确答案是C
２．It was not until 1920 ______ regular radio broadcasts began.
A.while
B.B .which
C.C .that
D.since
正确答案是C