问题描述：
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
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
问题解答：
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