单项选择题

John waited at the bus-stop for nearly half an hour ______ the bus finally arrived.

A．when
B．as
C．before
D．while
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单项选择题
AH of the guests by 9 o'clock, but the host ______ until 15 minutes later.
A．arrived; didn't turn up
B．had arrived; didn't turn up
C．arrived; hadn't turned up
D．had arrived; hadn't turned up
单项选择题
______ has ridden on a railway train knows how ______ another train flashes by when it is traveling in the opposite direction.
A．Anyone who; rapid
B．Whoever; rapidly
C．Anything that; rapid
D．Whatever; rapidly
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