—Has the doctor come yet? —No, but he ______ now, for it’s been 2 hours since he was ______.

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问题 —Has the doctor come yet? —No, but he ______ now, for it’s been 2 hours since he was ______.

选项 A、hasn’t; called for
B、must have; sent for
C、shall; looked for
D、should have; sent for

答案D

解析
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