---The front door refuses to open．---Why not ________ the back one?A.try to openB.try openingC.trying to openD.trying opening
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B解析此题前一句提供的信息是“前门打不开”．后一句建议“开后门试试”．首先Why not…？后不跟动名词形式，故排除C项与D项．其次try to do something表示“设法做某事”，而try doing something表示“尝试做某事”．本题中“前门打不开，尝试开后门”，故应选B项．