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Test seven18.only when it rains ______

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Test seven18.only when it rains ______
Test seven
18.only when it rains ______
A)does the river overflow
B)the river does overflow
C) overflow does the river
D) overflows the river
答案是A.原因是句子以only开头,主句要进行半倒装.所谓的半倒装就是不分谓语要提到主语的前面.另外是一些表示否定意义的词位于句首时主句要进行半倒装.
这里的谓语动词如果不倒装就是overflows,可是要部分提前的话,得给它加和其时态、语态一致的助动词,所以构成了does ...overflow; 如果是过去时,则变为did...overflow.
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