We should do more such exercises in the future，I think， those we did yesterday.
A. as
B. like
C. about
D. than
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A. as
B. like
C. about
(答案→)D. than
解析：考查介词：通过分析句子成分可知，I think是插入语，去掉之后再分析可知do more such exercises in the future后面搭配than，句意：我们在未来做得锻炼要比昨天的多。选D。