阿摩線上測驗
37. Riding your bicycle to work __________ a great way to exercise and save money.
(A) is
(B) are
(C) that is
(D) that are
答案：登入後查看
統計： A(509), B(15), C(49), D(4), E(0) #1934889
統計： A(509), B(15), C(49), D(4), E(0) #1934889