There are still many problems ______ before we are ready for a long stay on the Moon.
A．solvingB．solved
C．being solvedD．to be solved
D

試題分析：本題考查非謂語(yǔ)動(dòng)詞，考查方式為非謂語(yǔ)動(dòng)詞形式選擇。根據(jù)題干信息，非謂語(yǔ)動(dòng)詞在這里做定語(yǔ)，限定“要去解決的問(wèn)題”。根據(jù)非謂語(yǔ)動(dòng)詞做定語(yǔ)的規(guī)則，現(xiàn)在分詞表示主動(dòng)和正在發(fā)生，過(guò)去分詞表示被動(dòng)或完成，而不定式表示將要發(fā)生，所以選D。
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