问题补充:
Soon she swim a quarter of a mile.
A. can
B. could
C. is able to
D. will be able to
答案:
A. can
B. could
C. is able to
(答案→)D. will be able to
解析:can能,能够;could, can的过去式;is able to能够;will be able to能够。句意:不就她就能游四分之一公里了。结合语境可知本句描述的是将来的动作,故用一般将来时态,选D。