摘要： Mr. Wu this math problem him many times, but he still doesn’t understand it. A. explains ; to B. have explained ; for C. explained ; with D. has explained ; to
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Mr. Wu___this math problem____him many times, but he still doesn’t understand it.
A. explains ; to B. has explained ;
for C. ha
s
explained ; to D. explained ; with
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Mr. Wu___this math problem____him many times, but he still doesn’t understand it.
| A．explains ; to | B．has explained ; for | C．has explained ; to | D．explained ; with |