（陕西卷21）. I have to see the doctor because I a lot lately.
| A．have been coughing | B．had coughed | C．coughed | D．cough |
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（陕西卷21）. I have to see the doctor because I a lot lately.
| A．have been coughing | B．had coughed | C．coughed | D．cough |
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