we have been in grade nine_about four months.

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wehavebeeningradenine_aboutfourmonths.wehavebeeningradenine_aboutfourmonths.wehavebeeningradenine_ab

we have been in grade nine_about four months.
we have been in grade nine_about four months.

we have been in grade nine_about four months.
for,表示状况持续了多长时间.