STUDENTS ARE NOT ALLOWED TO HANDLE THESE CHEMICALS UNLESS THEY...

Question

Câu 6. Students are not allowed to handle these chemicals unless they _________under thesupervision of a teacher.A. are B. were C. have been D. had been

Accepted Answer

11 C 12 C 13 C 14 A 15 D 16 B 17 A 18 B 19 C 20 B 21 C 22 A 23 B 24 B 25 A 26 D 27 A 28 D 29 A 30 C 31 C 32 D 33 A 34 A 35 C 36 A 37 A 38 C 39 C 40 D 41 A 42 C 43 C 44 A 45 D 46 A 47 A 48 A 49 C 50 A....

STUDENTS ARE NOT ALLOWED TO HANDLE THESE CHEMICALS UNLESS THEY...

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