问题
选择题
Anyone can borrow books from this library _______ he keeps them clean and returns them in time.
A．even if
B．unless
C．so that
D．as long as
答案
答案：D
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Anyone can borrow books from this library _______ he keeps them clean and returns them in time.
A．even if
B．unless
C．so that
D．as long as
答案：D