问题

Years ago we didn’t know this , but recent science______that people who don’t sleep well soon get ill

A:showed
B:has shown
C:will show
D:is showing

正确答案是：

同类题型

She ____Chinese while traveling in China．

________ your mom at home today—Yes，but she ________yesterday.

They decide to ____________ their holiday until next month.[ ]

Would your brother go for a picnic. —If I don’t go,__________ .

The letter is ________in French. I cannot read it.