选D.since与现在完成时连用.
还有应该是improved .
____after he entered the unibersity his english has been much improve
____after he entered the unibersity his english has been much improve
a after
b before
c when
d since
which one
a after
b before
c when
d since
which one
英语人气：354 ℃时间：2019-08-21 13:34:23
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