问题

The Browns stood staring at the happy_______ of children playing in the park

A:has argued
B:has been arguing
C:have argued
D:have been arguing

正确答案是：

同类题型

look! There are a lot of boys___kites in the park.

Carl is studying foodscience at college and hopes to open up meatprocessing factory of his own one day.

Girls used to take fewer advanced math courses thanboys but now they are taking just _______.

Tom speaks English very well. He in China since 2002.

Where Anna from—She comes from the USA.