The old lady was standing by the window ____ suddenly she caught sight of a postman riding along.A.whenB.whileC.becauseD.so

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The old lady was standing by the window ____ suddenly she caught sight of a postman riding along.A.whenB.whileC.becauseD.so

The old lady was standing by the window ____ suddenly she caught sight of a postman riding along.A.whenB.whileC.becauseD.so
The old lady was standing by the window ____ suddenly she caught sight of a postman riding along.
A.when
B.while
C.because
D.so

The old lady was standing by the window ____ suddenly she caught sight of a postman riding along.A.whenB.whileC.becauseD.so
A
When:当……时
while:当……时,一般双方都是进行时,强调一种对比
because:因为
so:所以

A