选a. swimming。
She teaches us swimming.
她教我们(学)游泳。
teach是一个双宾语动词,后面可跟两个宾语。
swimming是直接宾语,us是间接宾语。
所以这句话还可以表达为:
She teaches swimming to us.
常见的双宾语动词有: award, buy, give, leave, lend, offer, pay, show, teach, tell,bring, do, make, pass, sell, send, sing, write,answer, deny, envy, refuse, save, spare等。
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