题目内容
He was walking along the street ________ he saw a red-haired boy.
[ ]
A.while
B.when
C.as
D.which
答案:B
提示:
提示:
|
be+doing…when…为固定搭配,意思是“正在……突然……”。其他搭配还有:be about to do…when…或be going to do…when…,刚想……突然……,其中when前面be的形式是一般过去式,后面也用一般过去时态;had done…when…刚做完……突然…… |
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