Up to now, our society ________ with limited living space and a shortage of natural resources.
A．has been challengedB．is being challenged
C．is challengingD．has challenged
A
A 考察動詞時態(tài)和語態(tài)。句義：到目前為止，我們的社會一直面試著生存生成空間有限和自然資源匱乏的挑戰(zhàn)。Sb/sth be challenged with sth意為“某人/某物面臨著…挑戰(zhàn)”，為習慣用法；根據(jù)時間狀語up to now可知，應用現(xiàn)在完成時。故A正確。
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