In spoken English, yes. On the GMAT verbal section, no.
Example: "Bob and Jill ate dinner with Jim and Mary. They enjoyed it." In spoken English, one would logically assume that "they" refers to Bob and Jill and be correct 99% of the time. On the GMAT, however, this would be incorrect because it is possible that "they" could be referring to Jim and Mary.
For a SC problem to be correct on the GMAT, every pronoun must
have a clear antecedent.
I hope that helps
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