3. GWD32-Q3 using the mirrors left on the lunar surface by the Apollo missions, mirrors allowing the Earth –Moon distance to be measured precisely by lasers, it has been determined by scientists that the moon is moving from the Earth at the almost imperceptible rate of thte3e to four centimeters per year .
1) allowing the Earth -Moon distance to be measured precisely by lasers .it has been determined by scientists that the moon is moving 2) allowing that the Earth-moon distance can be measured precisely lasers, scientists have been able to determine that the moon is moving 3)
that allow the Earth-Moon distance to be measured precisely by lasers ,it was determined byscientists that the lasers ,it was determined by scientists that the Moon is moving away 4) that allow that the Earth-Moon distance can be measured pre3cisely by lasers , scientisls were able to determine that the moon is moving away
题目好像有点不完整，虽然做对了，但是有点模糊。
选2）
根据现在分词的逻辑主语 排除1/3
在2与4中挣扎，我判断的依据是away与from构成redundant.
另外 完成时感觉也比较好一点（讲不清具体是什么 请nn解释谢谢） | 
