A.to be breathed
B.to breathe
C.breathing
D.being breathed
解析:考查 be+adj.+to do结构。
答案:B
(2)They found the lecture hard ______; they all felt sleepy.
A.to be understood
B.for understanding
C.to understand
D.to have been understood
解析:考查 “find+宾语+adj.+to do”结构。
答案:C
3.Once she has made up her mind, nothing can change it.
她一旦下了决心,什么也不能使她改变。
“once+状语从句”意为“一旦……就……”。
在 once引导的状语从句中常用一般现在时代替将来时。
①Once you remember it, you'll never forget it.
一旦你记住它,你就永远不会忘记它。
②Once you have promised, you must do it.
一旦你许下诺言,你就必须履行。
拓展:once 用做副词,可表示:
(1)(for) one time 一次
I have only been here once. 我只来过这儿一次。
(2)at some time in the past 一度,曾经
He once lived in Zambia. 他曾经(一度)住在赞比亚。
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