The chairman’s speech ______ the radio when I turned it on.
A．was broadcast onB．was being broadcast on
C．was broadcasting inD．broadcast over
B
考查時態(tài)以及介詞的用法。從when I turned it on可知，前句應(yīng)該用同進行時有關(guān)的時態(tài)；broadcast與speech之間存在被動關(guān)系，“通過收音機”可以用over/on the radio�！巴ㄟ^電視”則說：on TV（無冠詞）,“通過報紙”through newspapers。
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