The manager is talking with his secretary _____ the telephone. They usually keep in touch _____ telephone.
A．by ;onB．through; byC．on; onD．by ;with
B
考查介詞的用法。by當(dāng)“通過(guò)”講時(shí)，其后不加冠詞；through當(dāng)“通過(guò)”講時(shí)，其后加冠詞。
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