There are still many problems ______ before we are ready for a long stay on the
题型：不详难度：来源：
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 |
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答案
| D |
解析
试题分析：本题考查非谓语动词，考查方式为非谓语动词形式选择。根据题干信息，非谓语动词在这里做定语，限定“要去解决的问题”。根据非谓语动词做定语的规则，现在分词表示主动和正在发生，过去分词表示被动或完成，而不定式表示将要发生，所以选D。 |
举一反三
The film star wears sunglasses. Therefore, he can go shopping without ______..| A．recognizing | B．being recognized | | C．having recognized | D．having been recognized |
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the past year as an exchange student in Hong Kong, Linda appears more mature than those of her age.| A．Spending | B．Spent | C．Having spent | D．To spend |
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For those with family members far away, the personal computer and the phone are important in staying________.| A．connected | B． connecting | C． to connect | D． to be connected |
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Today there are more airplanes________ more people than ever before in the skies.| A．carry | B．carrying | C．carried | D．to be carrying |
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Children，when ______ by their parents, are allowed to enter the stadium.| A．to be accompanied | B．to accompany | | C． accompanying | D．accompanied |
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