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
B:where
C:what
D:whether
正确答案是：
同类题型
eatest pleasure I know is to do a goodaction quietly, and to have it _____ by accident
u have anything more ______, sir”“No. You can have a restordo something else.”
Who is the girl standing over there —Well, ifyou _____ know, her name is Kate.
He _____ without saying good-bye to them, for he always has good manners.