The students are preparing --------- the maths exam.A.at B.for C.with D.in

The students are preparing --------- the maths exam.A.at B.for C.with D.in
The students are preparing --------- the maths exam.
A.at B.for C.with D.in

The students are preparing --------- the maths exam.A.at B.for C.with D.in
B
prepare for为什么做准备

for
prepare...for 固定搭配 为...做准备
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B.for
prepare for 为……做准备