摘要： Every few years, the coal workers their lungs X-rayed to ensure their health. A. are having B. have C. have had D. had had
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Every few years, the coal workers their lungs X-rayed to ensure their health.
- A.are having
- B.have
- C.have had
- D.had had
Every few years, the coal workers their lungs X-rayed to ensure their health.
| A．are having | B．have | C．have had | D．had had |
Every few years, the coal workers their lungs X-rayed to ensure their health.
A．are having B．have C．have had D．had had
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Every few years, the coal workers ___________ their lungs X-rayed to ensure their health.
|
A．are having |
B．have |
C．have had |
D．had had |
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