单项选择题

The firemen arrived half an hour () the alarm was first raised, when it was too late to save much of the building.

A.since
B.after
C.as
D.until

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单项选择题
John is doing very well in school and it is quite ()that his mother should be proud of him.

A.normal
B.natural
C.general
D.usual
单项选择题
I was just coming out of the sea after a swim () I stepped on a sharp stone and cut my foot.

A.then
B.as
C.when
D.while
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