__for your knowledge of language,I should have been completely lost.

__for your knowledge of language,I should have been completely lost.
41.___ for your knowledge of language,I should have been completely lost.
A.If had not B.Hadn't it been
C.Not had it been D.Had it not been
42.A peculiarly pointed chin is his most memorable facial ______________.
A.mark B.feature C.trace D.appearance
43.Whenever anything ____________ happens,a crowd of people is certain to gather.
A.emotional B.sensational C.famous D.noted
44.Do you call them ______________?
A.apple trees B.apple trees C.apple tree D.apple's tree
45.Thank you for applying for a position with our enterprise.We do not have any opening this.
time,but we shall keep your application on___ for two months.
A.pile B.segment C.sequence D.file