Nowadays，_____birds fly to the warm south in winter.（ ）
| A． |
million |
B． |
millions |
| C． |
two millions |
D． |
millions of |
Nowadays，_____birds fly to the warm south in winter.（ ）
| A． |
million |
B． |
millions |
| C． |
two millions |
D． |
millions of |
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