【題目】Few students can understand the sentence until it _____ twice or three times.

A. explains B. is explained C. will be explained D. has explained

【答案】B

【解析】句意：直到那個(gè)句子被解釋了兩三次后，學(xué)生才能理解它。until引導(dǎo)的時(shí)間狀語(yǔ)從句用一般現(xiàn)在時(shí)表示一般將來(lái)時(shí)，結(jié)合句意，那個(gè)句子被解釋，故此處用一般現(xiàn)在時(shí)的被動(dòng)語(yǔ)態(tài)，故選B。

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