--Look! The telephone is broken. Someone damaged it ________ purpose.
--That may be right. But perhaps it was broken _________ accident.
A.on; by | B.by; by | C.on; on | D.by; on |
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--Look! The telephone is broken. Someone damaged it ________ purpose.
--That may be right. But perhaps it was broken _________ accident.
A.on; by | B.by; by | C.on; on | D.by; on |