Question

Choose an appropriate option to fill in the blanks:

Please hurry up! We ________ waiting ________ an hour.

• A. have been; since
• B. has been ; for
• C. has been ; since
• D. have been ; for
  

Answer 1

The correct option is D

have been ; for

The present perfect continuous tense (also known as the present perfect progressive tense) shows that something started in the past and is continuing to the present time. Here the action of waiting is continuing to the present. The present perfect continuous for plural subjects is formed using the construction have been + the present participle (root + -ing).

'For' is a preposition that indicates the duration of time, here, an hour, whereas 'since' refers to a particular point in time. Hence, Option D is correct.

The rest of the options do not express this condition. 'Has' (Options B and C) is a singular subject that follows a singular subject, whereas the subject 'we' is plural.

(Option A) 'Since' does not express a period of time 'an hour' but 'for' does.

Hence these options are incorrect.