How many people does the doctor know who______of the disease (疾病)?
A. are dying
B. is dying
C. has died
D. dies
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I______my homework now.
A. finish
B. finished
C. have finished
D. had finished
He______for three years.
A. has joined
B. has been in the army
C. joined
D. has served the army
His grandfather______for thirty years
A. died
B. was dead
C. has been dead
D. has died
I______ from my brother for a long time.
A. not have heard
B. have not heard
C. have heard not
D. do not hear
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