Which choice supplies a complete main-clause verb?
For thousands of years, people in the Americas the bottle gourd, a large bitter fruit with a thick rind, to make bottles, other types of containers, and even musical instruments. Oddly, there is no evidence that any type of bottle gourd is native to the Western Hemisphere; either the fruit or its seeds must have somehow been carried from Asia or Africa.
Which choice completes the text so that it conforms to the conventions of Standard English?
- to use
- have used
- having used
- using
Answer: B. have used
- Find the subject, "people in the Americas," and the blank that must supply its verb. "For thousands of years" gives a duration, but the first job is to make the main clause complete.
- Choose B, "have used." It is a finite present perfect verb phrase: have + the past participle used. The present perfect connects earlier use with the present frame of the passage.
Common trap
Do not call "have used" past perfect: past perfect would use had + a past participle. "To use," "having used," and "using" are nonfinite forms; none can serve alone as this main clause's verb. Do not choose a form just because it sounds related to a long duration.
Passage context: The passage simplifies the botanical background: bottle-gourd varieties can be bitter or non-bitter, and genetic research supports African ancestry for ancient American gourds. These details do not change the grammar choice.
Dolphin question bank #2717. Worked explanation reviewed .