九、不定式的否定形式：否定形式是在不定式的标志to前边加not a
39)that new information to anyone else but the sergeant.
[A] They asked him not to give [B] They asked him to don't give
[C] They asked him no give [D] They asked him to no give
40)Please remember lights on in the future.
[A] don't leave [B] not to leave [C] not leaving [D] don't to leave
41)The teacher told [A] the students to don't [B] discuss [C] the takehome exam with each other
十、介词except和but(作“只有……，只能……”讲时)跟不定式结构(but与不带to的不定式连用)
He seldom goes back home except to ask for money from his parents.
He did nothing there except watch TV for the whole night.(不带to的不定式)
I had no choice but to stay in bed.
Last night I did nothing but prepare my lessons.
42)Lots of empty bottles were found under the old man's bed.He must have done nothing but .
[A] drink [B] to drink [C] drinking [D] drunk
43)When the streets are full of [A] melting [B] snow,you cannot help but getting [C] your shoes wet
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