His job at the hospital did not pay much, so he found another ______ .A.on the riseB.on the spotC.on the declineD.on the side
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D解析on the side(="in" addition to a main thing) 额外；作为兼职：1）He ordered a hamburger with onions and French fries on the side. (="He" ordered a hamburger with onions and French fries extra.) 2)He does some house-keeping work on the side.(他帮人家做些家务活作为兼职。)on the rise(作表语)在上升；on the spot 现场；on the decline (做表语)在下降：The population in the country is on the decline. (这个国家的人口在下降。)