247.The desks we use today are much better than ______ we used five years ago.
A.which
B.those
C.these
D.them
248.This design is _______ satisfactory.So you'll have to try your best to better it.
A.nothing but
B.anything but
C.all but
D.something but
247.答案是B；此处指代the desks,为特指。
248.答案是B;考查不定代词与介词but的搭配。Nothing but=only 仅仅，只不过；anything but 除…以为的任何事物，根本不；all but 几乎不，差一点。根据you'll have to try your best to better it暗示，此项设计绝不令人满意。
