Only after a baby seal is pushed into the sea by its mother ______ how to swim.

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问题 Only after a baby seal is pushed into the sea by its mother ______ how to swim.

选项 A、will it learn
B、it will learn
C、has it learned
D、it has learned

答案A

解析 小海豚只有在被妈妈推进大海中时,才学会怎样游泳。only作副词置于句首时,主句采用部分到装结构,助动词位于主语前面,本句时态为一般现在时,故选A。
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