He often thinks of _____ he can do more for the four modernizations.

Heoftenthinksof_____ atD.whichthekeyisbwhynota

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因为这里有一个"more"He often think of what he can do for the four modernizations.就对了然而这里的more是作为一个名词的,表示"另外的事物"那样的话你就可以发现从句中he can do more for the four modernizatios是不缺成分的,除非是状语,那么自然用how来作疑问词