单项选择题

I was very sleepy. I tried ______ my eyes open but I couldn't.

A. keeping
B. having kept
C. to have kept
D. to keep
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He ______ a very interesting novel at six p. m. yesterday.
A. is reading
B. were reading
C. was reading
D. read
单项选择题
The happiness for the teacher is seeing children ______ so quickly.
A. developed
B. to be developed
C. develop
D. to develop
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