111. _____ mandatory to wear a lab coat and safety goggles at all times in the laboratory.
(A) There is
(B) There has
(C) It’s
(D) Its

答案：登入後查看
統計： A(52), B(32), C(389), D(10), E(0) #3079619

詳解 (共 1 筆)

#5907891
在實驗室裡，它是強制穿實驗室大衣和一直...
(共 176 字，隱藏中）
前往觀看
10
0