85. After school we went to the reading-room to do some reading, only to be told that it .
A. was decorated B. had decorated
C. had been decorating D. was being decorated
【答案】D.
【考点】考查动词时态和语态。
【解析】It 指代 the reading-room,所以只能用被动，考虑到only to be told 表示结果，所以选择D是自然地了
86. Walmart, which is one of the largest American supermarket chains, some of its store open 24 hours on Mondays through Saturdays.
A. keeps B. keep C. have kept D. had kept
【答案】A。
【考点】考查动词时态和语态。
【解析】首先把which 引导的非限制性定语从句删掉。三单否定B，同时也没有选择完成时的理由。
