问题

What really worries us is ______ the explorers can accurately locate themselves with the device in case of bad weather.

A:that
B:where
C:what
D:whether

正确答案是：

同类题型

up with_______headache, yet by___________evening the pain had gone

We all like teachers _____ kind to us.

I could have arrived much earlier, but I ____ in the traffic

The population of China ________ 13 billion，and 80% of the population________farmers

I don’t like cheese, because it too strong.