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_____hasshebeenyourEnglishteacher?Sinceshe______toChina.AHowlong...comesBWhen...comesCWhen...hascomeDHowlong...came
题目内容：
_____has she been your English teacher?Since she ______ to China.
A How long ...comes
B When...comes
C When...has come
D How long...came优质解答
D since 引导的从句常常用一般过去时,主句常常用现在完成时.
A How long ...comes
B When...comes
C When...has come
D How long...came
优质解答
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