The question of _________ English will keep on changing in the future, though most people doubt, is actually easy________.
| A．if; to be answered | B．whether; to answer |
| C．how; answered | D．what; to answer |
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The question of _________ English will keep on changing in the future, though most people doubt, is actually easy________.
| A．if; to be answered | B．whether; to answer |
| C．how; answered | D．what; to answer |
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