They___(write)letters the whole morning.用何时态、?

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They___(write)lettersthewholemorning.用何时态、?They___(write)lettersthewholemorning.用何时态、?They___(write)

They___(write)letters the whole morning.用何时态、?
They___(write)letters the whole morning.用何时态、?

They___(write)letters the whole morning.用何时态、?
wrote 因为有the whole morning,说明这个时间已经是过去的了,所以用过去式

They have been writing letters the whole morning.
现在完成进行时

have been writing