A study commissioned by the Department of Agriculture showed that if calves exercise and associated with other calves, they will require less medication and gain weight quicker than do those raised in confinedment.
A. the same
B. ...
C. associate with other calves, they required less medication and will gain weight quicker than do
D.associate with other calves, they have required less medication and will gain weight more quickly than do
E. associate with other calves, they require less medication and gain weight more quickly than
The best answer is E. I do not understand why not they will require ... and will gain, since it is conditional clause: if ..., they will. Who will help me out? Thank you.
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