英语问题请教高手，请详细解释。谢谢！
10.i am looking for a babysitter. She must be________too old_________too young.
A.neither…nor B.both…and C.either…or D.not only…but also
14.__________it was late at night, he was still working.
A.because B.as C.since D.although
15.he didn’t remember__________his bag.
A.where he puts B.where has he put C.where he had put D.where had he put
16.hurry up,__________you will miss the train.
A.and B.then C.either D.or
17.the room is___________small_________it can hardly hold 40 people.
A.such…that B.too…to C.so…that D.both…and
参考答案:A,我在找一个保姆。她必须不能太老也不能太年轻。A有既不能，也不能的意思。B既..又的意思C,或者...或者D，既要...又要。B,D逻辑上不对。文中要注意too,有太，过于的意思。有否定暗示。所以选择A
D,虽然已是深夜，但是他依然在工作。A,B又因为的意思，C,既然都与句意逻辑上不对。
C,他不记得他当时把包放哪里了。这个题考两个语法，1.where引导一个宾语从句，语序要按正常语序。2.他“放置包”动作发生在“他没想起来”之前，“他没想起来”已经使用过去时，所以“放置包”要提前一个时态，用过去完成时。
D,快点，不然你会误了火车。or在这里有“不然的话”的意思
C,房间太小以至于难以容纳40人。从句意逻辑角度A,D排除。B,to 动词不定式修饰语，后面要加动词原型。但是填空后面是一个句子，显然选怎C.