We don’t have to every word that we don’t know when reading.A. look upB. refer toC. look

问题补充：

We don’t have to every word that we don’t know when reading.

A. look up

B. refer to

C. look for

D. look into

答案：

(答案→)A. look up

B. refer to

C. look for

D. look into

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