你如何完成 “Look! The bus ___ now”？

问题

Look! The bus ___ now.

答案选项

1. is arriving
2. arriving
3. are arriving

答案

is arriving — Look! The bus is arriving now.

说明

Look! 和 now 表示此刻正在发生的动作。使用现在进行时：am/is/are + verb ending in -ing。

The bus 是单数，所以使用 is arriving。Arriving 单独使用时缺少助动词，而 are arriving 与主语不一致。