With the country’s population reaching 1.6 billion in the mid of this century, most of China’s rivers, including the Yellow River, ________

1. A.
   is drying up
2. B.
   will be drying up
3. C.
   dry up
4. D.
   have dried up

With the country's population reaching 1.6 billion in the mid of this century, most of China's rivers, including the Yellow River, ________.

A．is drying up 

B．will be drying up

C．dry up 

D．have dried up

With the country’s population reaching 1.6 billion in the mid of this century, most of China’s rivers, including the Yellow River, ________.

A. is drying up B. will be drying up    C. dry up       D. have dried up

With the country’s population reaching 1.6 billion in the mid of this century, most of China’s rivers, including the Yellow River, ________.

A. is drying up B. will be drying up    C. dry up       D. have dried up