【題目】Johnson won't answer the phone if he ________ the number.

A. knew B. doesn't know C. will know D. didn't know

【答案】B

【解析】句意:如果約翰遜不知道電話號碼,他就不接電話?疾閯(dòng)詞時(shí)態(tài)。本句是if引導(dǎo)的條件狀語從句,當(dāng)主句是將來時(shí)態(tài)時(shí),從句用一般現(xiàn)在時(shí),可排除C、D兩項(xiàng)。根據(jù)句意,本句是否定陳述,故選B。

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