In my opinion, life in the twenty-first century is much easier than ___________.
A．that used to beB．it is used to
C．it was used toD．it used to be
D

試題分析：句意：我認為，生活在21世紀要比過去容易得多。 than 引導的是一個比較從句，同一個人或物，現(xiàn)在和過去兩個不同的時間進行對比時，應該用人稱代詞，因此要有主語it，而used to be 是“曾經(jīng)的那個樣子”之意。故選D。
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