题目内容
Mary ____do her homework first when she gets home.
| A．is | B．have to |
| C．has to | D．are |
C
解析试题分析：句意：玛丽到家后得先做作业。Have to必须，不得不，后跟原形动词，当主语为三单时要变为has to。所以选C。
考点：考查情态动词。
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