书名：新多益阅读题库大全
页数：p.78 第4题
题目：Until recently, the Family Entertainment Arcade located in
the mall ____ not generating the revenue its owners expected.
(A)is (B)was
(C)to be (D)be
疑问：为什么答案是(B)不是(A)
也想问until可以搭配哪些时态
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书名：新多益阅读题库大全
页数：p.103 第20题
题目：Ms. Wang maintains that the customer service department never ____ to
the e-mail she sent last month regarding the defective product.
(A)replies (B)replied
(C)reply (D)replying
疑问：为什么答案是(B)而不是(A) 觉得是陈述事实而用现在式
谢谢高手的解惑~