Tom enjoys sports .A. eitherB. alsoC. as wellD. as long

问题补充：

Tom enjoys sports .

A. either

B. also

C. as well

D. as long

答案：

A. either

B. also

(答案→)C. as well

D. as long

解析：also，as well，用于肯定句，also常用于be动词，情态动词，助动词之后，行为动词之前；as well用于句末；either用于否定句中，置于句末；as long无此用法。结合语境可知本句指的是，汤姆也喜欢运动。故选C。