A IS THE ONLY POSSIBLE CORRECT ANSWER> PLZ READ THIS FULL Each means every single one. Therefore, each of students means every single student. Which means the sentence roughly changes to the following: "Every single student ___ been called in the Principal's room."Therefore, B IS WRONG AND A IS THE ONLY CORRECT ANSWER POSSIBLE.
The answer is A. 'Each' is a singular indefinite pronoun.. In this sentence 'Each' is the subject , NOT 'students'. Hence, following the rules of subject-verb agreement ( singular subjects use singular verbs, plural subjects use plural verbs) the answer should be option A (has). i found a useful website which explains the rules of subject-verb agreement well: http://guidetogrammar.org/grammar/sv_agr.htm
if you want to check how many of your questions answer are correct first see how many are marked green then pause the test and see 1 of the row has the last score written on them if the numerator is equal to the qestions marked green than that means the questions you did are all correct ð§¡ð§¡ð§¡â¤ððððð
its' however' because if you have said something and want to start with another topic then you don't use besides without the word that and the word that is not mentoined after besides so the key answer is A