_____ I entered, he was _____ in his book and didn’t notice me.
A.
When; devoted
B.
While; absorbed
C.
When, absorbed
D.
While, devoted
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参考答案:
举一反三
【简答题】Solving a problem can be broken down into several steps. First, the problem must be identified correctly. Psychologists refer (1) this step as problem representation. For many problems, figuring (2) w...