Mr. Smith didn’t go to the party because he had a lot of experiments _____. 
A．doB．didC．doneD．to do
D

試題分析：考查不定式的用法：句意：史密斯先生沒有去參加晚會,因為他有許多實驗要做。Have sth to do，有…事情要做，這里不定式做后置定語，修飾experiments，選D。
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