2. 外语
  3. If the new airboat does what it is to be doing—travel at high speeds undeterred by sandbars, crocodile-infested mudflats, or mar

If the new airboat does what it is to be doing—travel at high speeds undeterred by sandbars, crocodile-infested mudflats, or mar

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问题 If the new airboat does what it is to be doing—travel at high speeds undeterred by sandbars, crocodile-infested mudflats, or marshy hippo haunts—it could revolutionize transport on the 2,900-mile-long Congo River.
选项 A、If the new airboat does what it is to be doing
B、If the new airboat does what it is supposed to do
C、If it does as the new airboat is supposed to do
D、Doing what it is the new airboat is supposed to do
E、Doing what the new airboat is to be doing
答案B
解析 A、E中is to be doing是一种故意复杂化的表达，要表达进行时， “is doing”足矣。D中，结构故意复杂，且无法表示原句要求的条件语气；it指代除new airboat以外的物体，改变句意。B正确，大意为“如果这种新气垫船现在能达到原来设计要求的那些功能的话”(暗示：现在还未达到，因而才有主句的“could”——整个句子是对现在事实的虚拟，注意，此句中条件句的时态是一般现在时，而未用“did”)。
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