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20、At last they had to give up,for they found ____ difficult to finish so much work in such a  shot period of time.

A.that               B.this              C.so                 D.it

20、D

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At last they had to give up,for they found ____ difficult to finish so much work in such a  shot period of time.

A.that               B.this              C.so                 D.it

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