________ in bed for several hours, he felt much better.
A. Having lain
B. Having laid
C. Laying
D. Lying
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He made the request that the problem ________ at the meeting.
A. is discussed
B. discusses
C. be discussed
D. will be discussed
She was ________ and did not know what was waiting before her.
A. puzzling
B. puzzled
C. being puzzled
D. puzzle
Only when she started to explain ________ the reason for this.
A. she realized
B. did she realize
C. she had realized
D. had she realized
“偶数、偶尔、偶然”三个词的词性分别是：
A. 数词、形容词、副词
B. 名词、副词、副词
C. 数词、副词、副词
D. 名词、副词、形容词
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