单项选择题

Children tend to （） while playing, even if they make a promise before.

A. lose all count of time
B. keep all count of time
C. be aware of the passage of time
D. waste time

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单项选择题
Samuel was obliged to compromise on lesser questions.（）

A. was compelled
B. was delighted
C. was prepared
D. was only too ready
单项选择题
（） it or not, his discovery has created a stir in scientific circles.

A. Believe
B. To believe
C. Believing
D. Believed
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