Scientists are still wondering ________ the Egyptians built the pyramids so long ago.
| A．how it is that | B．how is it that |
| C．it is how that | D．that how it is |
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Scientists are still wondering ________ the Egyptians built the pyramids so long ago.
| A．how it is that | B．how is it that |
| C．it is how that | D．that how it is |
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