I didn’t understand ______ so much time on computer games.

A. why does he spend B. why he spends

C. why did he spend D. why he spent

D 【解析】句意：我不明白他為什么花這么多時(shí)間玩電腦游戲。本題考查賓語(yǔ)從句，注意語(yǔ)序用陳述句的語(yǔ)序，故排除A/C。結(jié)合句意可知，時(shí)態(tài)用一般過(guò)去時(shí)。故選D。
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