摘要：at the elementary school 在小学

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They are waiting ________.

A.
at the doctor
B.
at the doctor's
C.
in the doctor
D.
in doctor's

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He was ________ at this time yesterday．

A.
at the doctor
B.
at the doctor's
C.
in the doctor
D.
in doctor's

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Jim was _____ at this time yesterday.

A. at the barber
B. at the barber's
C. in the barber
D. in barber's

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The patients(病人)are waiting ________．

A.
at the doctor
B.
at the doctor’s
C.
in the doctor
D.
in doctor’s

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They're sitting __________

A. at the barber
B. at the barber’s
C. in the barber
D. in barber’s

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