Which sentence contains an error in the commands-and-requests contrast of object plus to-infinitive?
The conductor told the violinists to begin with the softer passage.
The chemist asked the technician label every sample before the freezer was closed.✓الإجابة الصحيحة
The referee told both captains to return to the centre circle.
The librarian asked the pupils to leave their wet coats by the door.
الشرح
The laboratory sentence is erroneous because asked the technician label omits to before the requested action. The tested pattern requires asked followed by the addressee and then a to-infinitive.