知到答案英语魔“法”棒（山东联盟）智慧树答案_2022年

第七章

It ___ Mike and Mary who helped the old man several days ago.
had been
are
were
答案:was
It was not until 1920 ___ regular radio broadcasts began.
when
since
whichShe said she would go and she ___ go.
didn’t
do
didIt was the training ___ he had as a young man ___ made him such a good engineer.
what; that
which; that
that; whatIt was not until 1936 ___ baseball became a regular part of Olympic Games.
then
that
which