Select the most appropriate option to fill in the blank no. 4.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. until.
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The most appropriate option for blank no. 4 is "until".
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"Pandas only eat fresh bamboo plants which the zoo had been importing from China until corona virus grounded most flights."
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This choice correctly indicates the timing of the problem of the grounding of flights.