He ______ his cartoon books to read but didn’t _______ one at last, so he asked his mother for help.
A.looked for; foundB.looked for; findC.found; look forD.find; look for在线课程B
解析：
分析句意后，不难看出本题主要是考查“寻找”和“找到”的词义辨异。很显然，前一空表示的内容是“寻找”，而后一空表示的内容为“找到”。