All you do now is _____ your homework.A、completeB、completingC、having completed

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问题 All you do now is _____ your homework.

选项 A、complete
B、completing
C、having completed
D、to have completed

答案 A

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，则作表语的不定式一般不带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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Inthesentence"Allthetaskshavingbeenfulfilledaheadoftime,theydecided