We haven't known ____ there is life on Mars.A.that B.if C.what D.and
We haven't known ____ there is life on Mars.A.that B.if C.what D.and
英語(yǔ)人氣：767 ℃時(shí)間：2019-08-20 04:18:17
優(yōu)質(zhì)解答
B我們還不知道火星上有沒(méi)有生命.there is life on Mars是一個(gè)賓語(yǔ)從句,而and是引導(dǎo)并列分句的,故排除D.there is life on Mars是一個(gè)意義十分完整的賓語(yǔ)從句,不缺任何成分,而what引導(dǎo)賓語(yǔ)從句時(shí)必須在從句中充當(dāng)主語(yǔ)...
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