jam and sam have waited at the bus stop (for two hours.)提问 ()()have jam and sam waitea atthe bus stop.

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jam and sam have waited at the bus stop (for two hours.)提问 ()()have jam and sam waitea atthe bus stop.

jam and sam have waited at the bus stop (for two hours.)提问 ()()have jam and sam waitea atthe bus stop.
jam and sam have waited at the bus stop (for two hours.)提问 ()()have jam and sam waitea at
the bus stop.

jam and sam have waited at the bus stop (for two hours.)提问 ()()have jam and sam waitea atthe bus stop.
How long 多久

How long

How long
对一段时间的提问要用how long 多久
对次数的提问要用 how often

how long

how long

Where