【題目】There are still many problems________ before we are ready for a long stay on the Moon.

A. solving B. solved

C. being solved D. to be solved

【答案】D

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

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