单项选择题

She couldn't help, even though she tried not to,（）at the strange clothes her friend was wearing.

A. to laugh
B. laugh
C. laughing
D. laughed

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单项选择题
When deeply absorbed in work,（）he often was, he would forget all about eating or sleeping.

A. where
B. that
C. what
D. as
单项选择题
—Did the book give the information you needed —Yes. But（）it, I had to read the entire book.

A. to find
B. find
C. to finding
D. finding
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