Select the most appropriate option to fill in blank number 4.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. have.
Context: The sentence continues describing the present state of these medicines, so present perfect is correct. '... and they ___ blossomed into orderly-regulated systems of medicine' needs “have blossomed” to show current relevance.
Analysis of the given options:
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have being – Grammatically incorrect
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have – Correct with “blossomed” to form present perfect
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had – Past perfect; incorrect here
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has – Subject is plural (“they”), so “has” is wrong
Correct word: have
Reason: “They have blossomed” matches plural subject and present perfect tense.
Hence, the chosen option is correct.