Tens of millions of Internet users make most of the half-price promotion and it isgood opp

Tens of millions of Internet users make most of the half-price promotion and it is good opportunity for online shopkeepers to get their names known.
A. a; the
B. /; the
C. the; /
D. the; a

A. a; theB. /; theC. the; /(答案→)D. the; a解析：句意：成千上万网络使用者使用半价促销的方式，使店主老板有机会使自己出名。make the most of尽量使用，是固定短语。opportunity是可数名词,这里不表特指，故用不定冠词。

对的，就是这个意思