So involved with puters ____ that the leaders at the summer puter camps often had to force them to break for sports.A.has the children beeB.did the children beeC.has bee the childrenD.became the children
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B解析这题考查倒装句的用法：so+adj+that句型，so+adj置于句首时，句子要部分倒装，即助动词情态动词be动词放在主语前，从that从句的过去时判断主句用过去时。选B。