It rains very heavily in this area, which has _______ annual rainfall of 7,000 mm, _______

ideal environment for forests.

A. the; an       B. an; 不填       C. an; an          D. 不填; the

It rains very heavily in this area, which has _______ annual rainfall of 7,000 mm, _______

ideal environment for forests.

A. the; an          B. an; 不填     C. an; an  D. 不填; the

It rains very heavily in this area, which has _______ annual rainfall of 7,000 mm, _______ ideal environment for forests．

A．the; an　　　　 B．an; 不填　　 C．an; an　　　 D．不填; the

It rains very heavily in this area, which has _______ annual rainfall of 7,000 mm, _______ideal environment for forests.

1. A.
   the; an
2. B.
   an; 不填
3. C.
   an; an
4. D.
   不填; the

It rains very heavily in this area, which has _______ annual rainfall of 7,000 mm, _______

ideal environment for forests.

A. the; an       B. an; 不填    C. an; an D. 不填; the

It rains very heavily in this area, which has _______ annual rainfall of 7,000 mm, _______

ideal environment for forests.

A. the; an  B. an; 不填 C. an; an   D. 不填; the

It rains very heavily in this area, which has _______ annual rainfall of 7,000 mm, _______
ideal environment for forests.