(2013·银川高三二模)It remains to be seen ________ this plan is practical enough to keep the project going.
| A．whether | B．how |
| C．where | D．when |
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(2013·银川高三二模)It remains to be seen ________ this plan is practical enough to keep the project going.
| A．whether | B．how |
| C．where | D．when |
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