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20、Although she said it was nothing serious, I insisted that a doctor ____ at once.

A. must be sent for                     B. will be sent for

C. should sent for                      D. should be sent for

20、D

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Although she said it was nothing serious, I insisted that a doctor ____ at once.

A. must be sent for                     B. will be sent for

C. should sent for                      D. should be sent for

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