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

A.knewB.doesn't knowC.will knowD.knows

【答案】B

【解析】

句意:如果杰克不知道號(hào)碼就不會(huì)接電話。

考查if引導(dǎo)的條件狀語(yǔ)從句。knew一般過去時(shí);doesn't know一般現(xiàn)在時(shí)的否定句;will know一般將來(lái)時(shí);knows一般現(xiàn)在時(shí)的肯定句。if引導(dǎo)的條件狀語(yǔ)從句,遵循主將從現(xiàn)的規(guī)則,故排除A、C項(xiàng);再結(jié)合前后句句意可知,這里是表達(dá)“不知道號(hào)碼就不會(huì)接電話”,所以從句應(yīng)為一般現(xiàn)在時(shí)的否定句,故排除D項(xiàng),故答案為B。

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