15．Let me take down ________ you've said ________ I forget．（　　）
A．that，whenB．what，beforeC．which，beforeD．what，when

分析 稍等一會(huì)兒，在我忘記之前讓我記下你所說的話．

解答 答案B．考查賓語從句和時(shí)間狀語從句．第一空需填入一個(gè)引導(dǎo)詞，作take down后的賓語從句，同時(shí)充當(dāng)從句you've said中said的賓語，用what．第二空為時(shí)間狀語從句，before I forget在我忘記之前．when表示"當(dāng)…時(shí)"．

點(diǎn)評 考查從句引導(dǎo)詞，先分清從句的類型，再根據(jù)引導(dǎo)詞在從句中充當(dāng)?shù)某煞执_定使用哪個(gè)引導(dǎo)詞．

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