论文索引号是issn吗:They usually relax 8 hours every day.(对画线部分提问)

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( ) ( ) ( ) ( ) they usually relax every day.

How many hours do.

How much time do they usually relax every day.

How many hours do

是4个空吗?如果是3个空的话,可以填how long do

How much time do they usually relax every day.

如果是四个空,那肯定是:
How many hours do

如果是三个空,那应该是:
How long do

How many hours do
How long exactly do
How long definitely do
How much time do