Question

Fill a suitable auxiliary verb in the blank:

Last night Don became ill suddenly. We ________ call a doctor.

• A. has to
• B. had to
• C. have to
• D. had

Answer 1

Answer: (B)

had to

The option B is correct. The sentence is in past tense which speaks about the necessity or requirement. 'Had' is the verb used for necessity or requirement for past tense; the sentence suggests an event happening last night so the effect of the action still lingers in the present although the action is already completed. So, we use 'had'.. Thus 'Had to' option is correct. Option A and C are not feasible since they are used with present tense.