_________ causes motion sickness continues to baffle scientists to this day.
(A) What
(B) That
(C) All
(D) The

答案：登入後查看
統計： A(290), B(28), C(14), D(15), E(0) #396948

詳解 (共 3 筆)

#602967
what =先行詞+關係代名詞
5
0
#611241
baffle使困惑
3
0
#1015470
(The thing which)=What causes....
1
0