1.This is ___ difficult problem that few studants can work i

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1.This is ___ difficult problem that few studants can work it out.
A.so B.so a C.such D.such a
2.___ the movie star goes,there are crowds of fans waiting to see her.
A.When B.However C.Where D.Wherever
3.They were all so tired that they could ____.
A.do nothing but sleep B.do anything but sleep
C.do nothing but to sleep D.do anything but to sleep
4.I don't have to introduce him to you ____ all of you know him.
A.until B.unless C.since D.but

DDAC
1 固定搭配：so+adj+(a) 被修饰的词+that such+(a)+adj+被修饰的词+that
2由句意可知“无论这个电影明星到哪里,总有一群等着看他的影迷”
3do nothing but do have no choice but to do can't but do固定搭配,前有do后无to（do nothing but do和can't but do后用do的愿因,是与前面的状态保持一致
have no choice but to do之所以用to do 是用来为have no choice表目的而用不定式）
4 since有“既然”的意思,“既然你们都知道他,那我就不用向你们介绍他了”由句意只有D符合题意

1.This is ___ difficult problem that few studants can work i This math problem is so difficult that few students can work this is such a difficult problem that few students can work this math problem is ___ difficult.___ students can't work i This is such a diffcult problem that few students can work i 1.The math problem is so difficult that I can't work it out. This problem is so difficult that nobody can work it out. This problem is so difficult that we can't work it out.(保持句意 This problem is so difficult that nobody can work it out.(保持 He is so w____ that he can work out this difficult problem e ---Is this math problem difficult? ---No, I can work it out This Maths problem is difficult.I can't work it out.的同义句