The boy who ___(wear) a black coat now is very clever.
问题描述：
The boy who ___(wear) a black coat now is very clever.
答
The boy who (is wearing) a black coat now is very clever.
虽然用wears也是可以的 但是后面有个now 考虑到出题人的意图 还是用现在进行时好一些.