The group of research workers are said to ________ to the dangerous nuclear radiation while they carried out their rescue task.
A．be exposedB．have been exposedC．exposedD．be exposing
B
考查非謂語動(dòng)詞。are said to do…據(jù)說……，所以排除C；且動(dòng)詞expose和邏輯主語The group of research workers是動(dòng)賓關(guān)系，所以要用不定式的被動(dòng)形式，排除D；expose這一動(dòng)作發(fā)生在主句謂語動(dòng)詞are said之前，所以要用不定式的完成被動(dòng)式。所以選B。
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