201712T28 _______the library for hours without finding anything useful, I turned to my professor for help.
A.
Having searched
B.
To search
C.
Have searched
D.
Searching
拍照语音搜题,微信中搜索"皮皮学"使用
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参考解析:
知识点:
皮皮学刷刷变学霸
举一反三
【单选题】— What were you doing when I rang you yesterday afternoon? — I was occupied ______ the housework and kept my daughter occupied ______ her homework. [ ]