The little boy is dirty from head to foot because he ________ in the mud all morning.
#104514
A
has played
B
is playing
C
has been playing
D
was playing
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Hurry up, kids! The school bus _______ for us!
#100583
A
waits
B
was waiting
C
waited
D
is waiting
The days we have been looking forward to ____ soon.
#104465
A
coming
B
will come
C
came
D
have come
--- I ____ so busily recently that I ____ no time to help you with your maths.---That’s OK. I can manage it by myself. 
#100194
A
had been working; had had
B
have been working; had
C
have been working; have
D
am working; will have