When the old man ______ to walk back to his house, the sun ______ itself behind the mountain.
A．started; had already hiddenB．was starting; hid
C．had started; had already hiddenD．had started; was hiding
A

試題分析： 考察時態(tài)。句意：當老人開始走回自己的房子的時候，太陽已經躲在大山后面了。根據(jù)句意可知太陽落山是先發(fā)生的事情，然后老人才回家。要注意動詞的先后關系，故A正確。
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