He _______ foreigners in his cafe before, so he didn’t know how to serve the American family.
A．had rarely hadB．had had rarelyC．rarely hadD．had rarely
A
考查時態(tài)。由關(guān)鍵詞before可知沒有外國人來他的咖啡店發(fā)生在第二句之前，應該使用完成時。副詞rarely要放在助動詞和行為動詞之間。句意：以前沒有外國人來他的咖啡店，所以他不知道怎么給美國家庭提供服務。
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