--Alice, why didn't you come yesterday?
--I _________, but I had an unexpected visitor.
A．hadB．wouldC．was going toD．did
C 
當(dāng)不定式在某些結(jié)構(gòu)后作復(fù)合謂語時，不定式符號 to后的內(nèi)容可以省略。常見的結(jié)構(gòu)有：be able to，be going to，have to，ought to，used to等。
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