International trade in the world's 20-odd varieties of sturgeon ________ by the United Nations since 1998, after a drastic rise in poaching.
A. is controlled
B. is supported
C. has been regulated
D. has been promoted
IUBSPRINGইংরেজি - গ্রামার ও ভোকাবুলারিTense and Sequence of TenseTense and Sequence of Tense (Topic Practice)IUB - ⚡ অনলাইন প্রশ্নব্যাংক দেখুন 💥
সঠিক উত্তরঃ
A.
is controlled
Explanation:
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