how long does each math class last?for an ()60 minutes.

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howlongdoeseachmathclasslast?foran()60minutes.howlongdoeseachmathclasslast?foran()60minutes.howlongd

how long does each math class last?for an ()60 minutes.
how long does each math class last?for an ()60 minutes.

how long does each math class last?for an ()60 minutes.
hour 特例,h不发音 用an hour而不是a hour.