_____has she been your English teacher?Since she ______ to China.A How long ...comesB When...comesC When...has comeD How long...came
问题描述：
_____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
答
D How long. 多长..came（Since自从--以来，接从句通常用一般过去时）
答
D, 对多长时间进行提问用how long, 回答是为避免重复省略了主句She has been our English teacher，since从句后跟一个时间点，所以用过去时表示她到来中国的时刻。
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.