按照我国的相关规定，我国企业在计算资产的计税基础时用（）减去以前期间已税前扣除的金额进行计算。

A、帐面价值

B、取得成本

C、重置成本

D、应纳税暂时性差异

Not for a moment ______ that this disease was caused by certain virus.

A．he have doubted

B．he doubts

C．did he doubt

D．he did doubt