[Grammar] must have drunk?

[nado92]

The bottle is half-empty;someone.....my juice
a)must drink
b)must have drunk
c)must have been drinking
d)must be drinking

I chose 'must have drunk' am I right??

 

[albertino]

The bottle is half-empty;someone.....my juice
a)must drink
b)must have drunk
c)must have been drinking
d)must be drinking

I chose 'must have drunk' am I right??

(Not a teacher) Yeah, you're right.

 

[bhaisahab]

The bottle is half-empty;someone.....my juice
a)must drink
b)must have drunk
c)must have been drinking
d)must be drinking

I chose 'must have drunk' am I right??

If the bottle is only half-empty c) "must have been drinking" is more appropriate. If it were empty b) "must have drunk" would be correct.

 

[Raymott]

The bottle is half-empty;someone.....my juice
a)must drink
b)must have drunk
c)must have been drinking
d)must be drinking

I chose 'must have drunk' am I right??

b, c, and d work.
d assumes that you've left your drink, and periodically someone is coming and drinking it.

c is most likely.

 

[Kamila M]

At my university (in Poland), if I circled b or d I would get no point. The only correct answer for non-native teachers is C. And if the bottle were completely empty, then the proper answer would be B.