There ________some writing paper on my desk.A is B are C am D werewriting paper是可数还是不可数名词?如果是可数,单数和复数一样吗

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There ________some writing paper on my desk.A is B are C am D were
writing paper是可数还是不可数名词?如果是可数,单数和复数一样吗

A,只看paper即可,不可数