To understand the complex situation completely requires more thought than ________ so far.
A．gaveB．has givenC．has been givenD．is being given
C
由so far 可知用現(xiàn)在完成時(shí)，因?yàn)閟o far是現(xiàn)在完成時(shí)的標(biāo)志，由語意知此處為被動(dòng)，因此選擇C項(xiàng)
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