Washington (AFP) – US private businesses saw surprisingly weak hiring in April, a survey showed Wednesday, amid low unemployment that’s made their quest to find workers even more difficult. Payroll services firm ADP reported private employment rose 247,000 last month, considerably less than expected and down from March’s upwardly revised total. The survey is considered a preview of the government jobs report due out Friday, and could foreshadow weak hiring overall last month in the US economy, where unemployment has nearly returned to the level it had before Covid-19 caused mass layoffs two ye…