专四
A．complete
B．completing
C．having completed
D．to have completed
【解析】此题考查的是，在svc(主、系、表)句型中，如果主语部分有实义动词do的某种形式，则作主语补足语的不定式既可带to也可不带to。所以，正确答案为选项A。注意，D的不定式时态不当。
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A．jerked
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