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Q.

Fill in the  blank with present perfect tense:

We haven't worked [[1]] last December. 

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Start JEE / NEET / Foundation preparation at rupees 99/day !!

21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!
An Intiative by Sri Chaitanya

answer is SINCE.

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Detailed Solution

When time period is long time ago in last we use 'since'. Moreover in the above sentence have +ed is used with which since completes the sentence.

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Get ₹ 1 crore* worth scholarship for JEE / NEET / Foundation
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