题目内容：

He will be more than glad ___there are plenty of books at hand.A as if B as long as C now that D...
He will be more than glad ___there are plenty of books at hand.A as if B as long as C now that D in order that

优质解答

B as long as
只有有足够的书,他就.
因为用了will be 将来时,
主将从现,是典型的条件句.
A 好象
C既然,_用这个前面应该是现在一般时.
D 为了.
都不通.