题目内容

1 spent half an hour _________ this difficult math problem.

A. having worked on B. to work on C. on work D. working on

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Not until I reminded him for the third time ____working and looked up.

A. that he stopped B. does he stopped C. did he stop D. that he stopped

Any student who _________ his homework is unlikely to pass the examination.

A. reduces B. offends C. practices D. neglects

. affair

请选择（62）处最佳答案。

A. to
B. in
C. for
D. on