问题
选择题
Sorry, he _____ help his mother.
A．had to
B．has
C．has to
D．have to
答案
答案：C
C have to“不得不”，有人称和时态的变化。主语he是第三人称单数，故用has to。
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Sorry, he _____ help his mother.
A．had to
B．has
C．has to
D．have to
答案：C
C have to“不得不”，有人称和时态的变化。主语he是第三人称单数，故用has to。