【題目】The number of students in our class ____ 50. And a number of students _____ planting trees now.

A. are, are B. is, is C. are, is D. is, are

【答案】D

【解析】句意：在我們學(xué)校學(xué)生的數(shù)目是50，許多學(xué)生現(xiàn)在正在種樹。The number of+名詞的復(fù)數(shù)，表示……的數(shù)目，謂語動(dòng)詞用單數(shù)；a number of+名詞的復(fù)數(shù)，表示許多……，謂語動(dòng)詞用復(fù)數(shù)。根據(jù)題意，故選D。

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