【題目】The river ________ at least 50 meters in width, but the ten-year-old boy can swim across it within minutes.

A. is measured B. measures

C. is measuring D. is being measured

【答案】B

【解析】

考查時(shí)態(tài)。句意：這條河的寬度至少有50米，但10歲的小男孩可以在幾分鐘內(nèi)游過。此處measure（測(cè)量，估量）是不及物動(dòng)詞。這里講的是一個(gè)事實(shí)，句子用一般現(xiàn)在時(shí)態(tài)，主語是The river，是單數(shù)第三人稱，故答案為B。

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