Up to the present time oceanographers _____lots of seafloor mountains they _____existed.

A wee finding/don't know
B have found/haven't know
C are finding didn't know
D will find/wouldn't

Correct Answer: have found/haven't know

বাক্যটির up to the present time অংশটি দ্বারা present tense - কে নির্দেশ করে। সুতরাং বাক্যটি present tense এর structure follow করবে। তাই শূন্যস্থানে have found এবং haven't known বসালে বাক্যটি যথাযথ হবে।
Bissoy MCQ

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