Since then, more than 2 billion apps have been downloaded at prices ________ free to $900.
A．ranging betweenB．ranging fromC．rang betweenD．rang from
B
考查非謂語(yǔ)動(dòng)詞。range from從 ... 到 ... 范圍，在句中作定語(yǔ)，修飾名詞price，為主動(dòng)關(guān)系，故用現(xiàn)在分詞，選B。
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