...nowadays things _________ changed.

...nowadays things _________ changed.

• A. Has
• B. Had
• C. Having
• D. Have

Answer: (D)

The key idea is using the present perfect to talk about changes that have happened up to now, with the verb agreeing with a plural subject. Here, things is plural, so the auxiliary must be have. The form have changed combines have with the past participle changed to show that the change occurred at an unspecified time before now and is relevant to the present. The word nowadays signals this present relevance, reinforcing that a shift has occurred up to the present moment. Other forms don’t fit: has would match a singular subject, not a plural one; had places the action entirely in the past with no present connection; having isn’t a finite verb form for this clause.

The key idea is using the present perfect to talk about changes that have happened up to now, with the verb agreeing with a plural subject. Here, things is plural, so the auxiliary must be have. The form have changed combines have with the past participle changed to show that the change occurred at an unspecified time before now and is relevant to the present. The word nowadays signals this present relevance, reinforcing that a shift has occurred up to the present moment. Other forms don’t fit: has would match a singular subject, not a plural one; had places the action entirely in the past with no present connection; having isn’t a finite verb form for this clause.