THOUSANDS OF NATIONAL PARKS ALL OVER THE WORLD_________ TO PROTECT...

Question

23. Thousands of national parks all over the world_________ to protect endangered animals.A. has been established B. has been establishingC. have been established D. have been establishing

Answer

23. Thousands of national parks all over the world_________ to protect endangered animals.A. has been established B. has been establishingC. have been established D. have been establishing

THOUSANDS OF NATIONAL PARKS ALL OVER THE WORLD_________ TO PROTECT...

23. Thousands of national parks all over the world_________ to protect endangered animals.

A. has been established B. has been establishing

C. have been established D. have been establishing

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