Itwasn’tuntil

問題詳情：

 It wasn’t until_______that_______to prepare their lessons.

A. did the teacher come in; the students began

B. the teacher came in; the students began

C. did the teacher come in; did the students begin

D. the teacher came in; did the students begin

【回答】

【解析】選B。考查含有not . . . until的強調結構。句意: 直到老師進來，學生們才開始準備功課。“It was not until . . . that . . . ”，主句和從句都用陳述語氣。

知識點：一般過去時及其被動式

題型：選擇題