[ Grammar ]
Rinas ____ a test right now.
A. writting
B. writes
C. write
D. is writing
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Grammar › ViewIn my chemistry study group, there are eight students, two of whom are repeating the class.
A. correct
B. incorrect
Grammar › View
3-D printing ____ complex tools and components.
A. is used for produce
B. is used to produce
C. uses for producing
D. uses to produce