since和for用什么来提问We have used the taxi since 1910.(对1910提问)

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since和for用什么来提问Wehaveusedthetaxisince1910.(对1910提问)since和for用什么来提问Wehaveusedthetaxisince1910.(对1910提

since和for用什么来提问We have used the taxi since 1910.(对1910提问)
since和for用什么来提问
We have used the taxi since 1910.(对1910提问)

since和for用什么来提问We have used the taxi since 1910.(对1910提问)
since 时时间点,用when
for 时时间段,用how long

since用when
for用how long