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"lf competent teachers __________, we ________, among other...

Attention! The following questions are NOT related to the previous text:

"lf competent teachers __________, we ________, among other professions, scientists, engineers or doctors".


The correct verb forms that, respectively, fill the blanks in the sentence above is:


A

had not existed / would not have


B

do not exist / did not have


C

didn't exist / 'd not have


D

wouldn't exist / didn't have