51.As I spoke I observed a large dog lying on the sunny grass beneath______ its ears as if about to bark.

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问题 51.As I spoke I observed a large dog lying on the sunny grass beneath______ its ears as if about to bark.

选项 A、raise
B、raised
C、to raise
D、raising

答案A

解析 此题考查动词不定式的用法,observe接不定式作宾语时,要接省略to的动词不定式。lying on the sunny grass beneath是分词短语作dog的定语。英语中表示“看”、“观察”、“注视”意义的词,都具有同 observe 相同的用法,如:see,notice, wamh。
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