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

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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
单项选择题
The lecture seemed to have () only a short time, although the clock said it had gone on for more than an hour.

A.cost
B.lasted
C.spent
D.passed
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