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16.The directions for operating this machine were so complex that we could not understand.

分析 操作这台机器的说明书太复杂以致于我们都没看懂.

解答 85.complex  complex是一个形容词,意为"复杂的,难懂的",由后一句we could not understand(不能理解)可知,说明书很复杂难懂(complex),这里还考查so…that…的句型,表示"如此…以致于…",so后面加形容词,故填complex.

点评 考查形容词词义.在熟记单词词义基础上要联系语境,从而写出正确答案.

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