摘要：There has been life on earth for years.
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Scientists think there has been life on Earth for ________ years．
[ ]
A．millions of
B．hundreds of
C．five million of
D．million of
Scientists think there has been life on Earth for ________ years.
[ ]
A．millions of
B．hundreds of
C．five million of
D．million of
Scientists think that there has been life on Earth for _______ years.
| A. millions | B. millions of | C. million of | D. million |
Scientists think that there has been life on Earth for _______ years.
|
A. millions |
B. millions of |
C. million of |
D. million |
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