It is known to us that without passport travelling abroad is out of question.A. a; theB.

问题补充：

It is known to us that without passport, travelling abroad is out of question.

A. a; the

B. 不填；不填

C. the; a

D. the; 不填

答案：

(答案→)A. a; the

B. 不填；不填

C. the; a

D. the; 不填

解析：考查冠词。句意：据我们所知没有护照，出国旅行是不可能的。结合语境可知前文泛指任何一本护照，故用不定冠词。短语out of the question不可能的，毫不可能；下文特指出国这个question故用定冠词。故选A。