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The main difference between the investigation and the previous ones is that ______.A.the r


The main difference between the investigation and the previous ones is that ______.

A.the researchers started with only one month old infants

B.the observers could rate the quality of child care efforts and analyzed them soon

C.the researchers were able to give the questionnaires to mothers in their homes

D.video equipment enabled researchers to observe what was happening directly

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