【題目】We can’t figure out ______ quite a number of insects and birds are dying out．

A． that B． as C． why D．when

【答案】C

【解析】我們無法弄明白為什么相當(dāng)多的昆蟲和鳥兒正在沒絕。根據(jù)句意，故選C

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