13.Not until his parents criticized him to realize his mistake.( )
A. | does Tom begin | B. | did Tom begin | C. | Tom began | D. | had Tom began |
12.The reason I was keeping an eye on him was I doubted he was a thief.( )
A. | because; why; that | B. | why; because; whether | ||
C. | why; that; that | D. | why; that; whether |
5.Nearly3.500years ago,people chewed on leaves or drank a kind of tea made from leaves_____ a special chemical _________ body pains and fever.( )
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A. | possessed; reducing | B. | possessing; to reduce | ||
C. | possessed; reduced | D. | possessing; reduced |