5. A recent poll shows that, due to animal overpopulation concerns, dog owners had elected to spay and neuter their pets rather than let them reproduce.
- had elected to spay and neuter their pets rather than let them reproduce.
- had elected to spay and neuter their pets instead of letting them reproduce.
- have elected to be spaying and neutering their pets instead of reproduction.
- have elected to spay and neuter their pets rather than let them reproduce.
- have elected to spay and neuter their pets rather than reproduction.
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