In my opinion, life in the twenty-first century is much easier than ____.
A．what used to beB．that it used to be
C．it used to beD．what it used to be
D
考查賓語(yǔ)從句。used to do“過(guò)去（常常）”；be缺少表語(yǔ)，用what；句意“在我看來(lái)，21世紀(jì)的生活比過(guò)去的生活容易的多�！�。故選D。
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