[ Tenses ]
The teacher ____________ many times but they still don’t understand.
A. has explained
B. will explain
C. is explaining
D. explain
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Grammar › ViewIt doesn’t pay to resort on / in / to / with tough measures.
A. in
B. on
C. to
Grammar › View
She has been working for this company ___ 20 years.
A. since
B. for
C. yet