There ___ great changes in computers in the last few years.A.have hadB.haveC.have beenD.has been

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There ___ great changes in computers in the last few years.A.have hadB.haveC.have beenD.has been
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There ___ great changes in computers in the last few years.A.have hadB.haveC.have beenD.has been
There ___ great changes in computers in the last few years.
A.have had
B.have
C.have been
D.has been

There ___ great changes in computers in the last few years.A.have hadB.haveC.have beenD.has been
c