摘要：30． While watching television . A.the doorbell rang. B. the doorbell rings. C.we heard the doorbell ring. D. we heard the doorbell rings.
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While watching television,______.
A. the doorbell rang
B. the doorbell rings
C. we heard the doorbell rings
D. we heard the doorbell ring
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While watching television,__________.
A.the doorbell rang B.the doorbell rings
C.we heard the doorbell ring D.we heard the door bell rings
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While watching television, ______.
[ ]
A. the doorbell rang
B. the doorbell rings
C. we heard the doorbell ring
D. we heard the doorbell rings
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B. the doorbell rings
C. we heard the doorbell ring
D. we heard the doorbell rings