Color TV was first shown in 1929. It took more than two decades, ________, until 1951, forcolor broadcasts to begin in the USA.A. though B. therefore C. otherwise D. anyway
Only when I left my parents for Italy ___ how much I loved them.
It was not until 1920 ___ regular radio broadcasts began.
The reason _____ he explained is ___ she was ill.
_______, the disease diphtheria would produce a powerful poison that would kill the paient.
He ___ in Nanjing where he ____ by his aunt.