They ............... each other for a long time now.
Ahave known
Bhas known
Chave been known
Dhas been known
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The Speaker is away on holiday; he ..... to London
They ..... since morning.
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The physician has discovered(A)/ that the patient(B)/ had drunk poison(C)No error(D).
Pick out the past perfect tense from the following.
I ______ for half an hour when it suddenly started to rain.