问题
What _____ Kathy fell and hurt her knee?[ ]
A: weather
B: whether
C: through
D: if
B: whether
C: through
D: if
正确答案是：
同类题型
Which is ____________, the telephone, the computer or the light bulb?
“__________ do you watch TV?”—“Every day.”
Teenagers _______ allowed to drive a car. — That’s true. It’s too dangerous for them to drive a car.
They will call us as soon as they ______ there.
There are about seven ____ students in Grade Eight in Chezhan Middle School.