The new driving test seems to be challenging，so the chances he can pass it at the first attempt are small.
A. how
B. whether
C. that
D. where
网友回答
A. how
B. whether
(答案→)C. that
D. where
解析：
句意为： 新的驾考似乎具有挑战性，所以他第一次通过的可能性很小。the chance(s) that...“……的机会”。