单选题：Ispenthalfanhour（　　）thisdifficultmathproblem．

题目内容：

Ispenthalfanhour（　　）thisdifficultmathproblem． A．havingworkedon
B．toworkon
C．onwork
D．workingon

参考答案：

答案解析：

Forthispart,youareallowedthirtyminutestowriteacompositionont

Forthispart,youareallowedthirtyminutestowriteacompositiononthetopic"ReadingSelec

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