2. 外语
  3. In order to sustain a snowfall, there must be ______to feed the growing ice crystals.

In order to sustain a snowfall, there must be ______to feed the growing ice crystals.

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问题 In order to sustain a snowfall, there must be ______to feed the growing ice crystals.
选项 A、a constant inflow of moisture is
B、of a constant inflow of moisture
C、a constant inflow of moisture
D、moisture constantly flows in
答案C
解析 The noun phrase a constant inflow of moisture is the true subject of the second clause; there is the false subject.
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