要理由there _____(be) less than here than usual since last month.

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要理由there_____(be)lessthanherethanusualsincelastmonth.要理由there_____(be)lessthanherethanusualsincelast

要理由there _____(be) less than here than usual since last month.
要理由there _____(be) less than here than usual since last month.

要理由there _____(be) less than here than usual since last month.
has been
since引导过去时间,主句就用现在完成时.