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几道英语单选1.the question was so___that there was a___expression

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几道英语单选
1.the question was so___that there was a___expression on the teacher's face
A puzzled puzzling B puzzled puzzled C puzzling puzzled D puzzling puzzling
2.I was tired out that evening,but i ___form falling asleep by a sharp pain in my stomach.
A was prevented B had prevented C has prevented D am prevented
几道英语单选1.the question was so___that there was a___expression
puzzling是形容物; puzzled是形容人的表情,故选C
prevent sb. from doing sth.,这是固定的短语用法,表示阻止某人做某事.整句的意思是:我昨晚筋疲力尽了,但因为胃中剧痛所阻而不能入睡.这里当然是我被阻止,所以要用被动,故选A