题干
—With the country’s pension fund gap becoming wider than ever, retirement age should be postponed immediately.
—Easier said than done. ________ we take all factors into account, we shall be faced with some other social problems.
—Easier said than done. ________ we take all factors into account, we shall be faced with some other social problems.
| A．Unless | B．Until | C．When | D．Once |
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