They usually ()(run)for half an hour every morning.
问题描述:
They usually ()(run)for half an hour every morning.
答
首先这个句子缺少动词,every morning是一般现在时的标志,所以添run
答
要用run。因为这个空要用动词的谓语形式,running是动词的-ing形式,非谓语形式。 run run run 就填原形run,因为这个句子是在陈述一个
答
run