With the loss of labor，the old farmers ________at home had to choose less labour­intensive crops.

A. left B. to leave

C. having left D. leaving

A

【解析】

試題分析：句意是：隨著勞動力的損失，留在家里的老農(nóng)民們不得不選擇較少勞動密集型的作物。left被留下、被剩下, 與the old farmers之間是被動關(guān)系，所以選A

考點(diǎn)：考查非謂語動詞。

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