文章の中の間違っている語句を選びなさい。

The best merit is [A)which] we can use a computer network and [B)improve] [C)efficiency] of accounting calculations [D)such as] sales and cost.

文章の中の間違っている語句を選びなさい。

Mr. Smith [A)told] the secretary that she [B)had to] [C)finish] the job completely [D)till] the time she went home.