I …………………………. many musical instruments, but my favorite is the piano.
A.learned
B.learn
C.have learned
D.had learned
Answer and Feedback
Answer:C
Feedback: To suggest the completion of an activity in the unspecified or unknown past, we use the present perfect tense. The present perfect tense is not used with a past time of reference. In that case, we have to use the past simple.