He put up a map ___ the back wall becaus
问题:
He put up a map ___ the back wall because there was a hole ___ it. [ ]
A. on; on
B. at; in
C. on; in
D. on; at
He put up a map ___ the back wall because there was a hole ___ it. [ ]
A. on; on
B. at; in
C. on; in
D. on; at