No English teacher . . . . . . . . to the school till nowadays. A. has been B. was appointed C. had been appointed D. is appointed E. were appointed

The correct answer is A. has been.

The sentence is in the present perfect tense, which is used to talk about things that have happened or been true up to the present moment. The other options are not in the present perfect tense.

B. was appointed is in the simple past tense, which is used to talk about things that happened at a specific time in the past.
C. had been appointed

is in the past perfect tense, which is used to talk about things that happened before another event in the past.
D. is appointed is in the simple present tense, which is used to talk about things that happen regularly or repeatedly.
E. were appointed is in the simple past tense, which is used to talk about things that happened at a specific time in the past.

In this case, we are talking about a situation that has been true up to the present moment, so the present perfect tense is the most appropriate tense to use.