【題目】Doing exercise every day ____ good for our health.

A.areB.isC.wasD.were

【答案】B

【解析】

句意：每天做鍛煉對我們的健康是有好處的。

are是，系動詞，用于主語為復(fù)數(shù)或第二人稱you的時候；is是，系動詞，用于主語為單數(shù)時；was是is的過去式；were是are的過去式。根據(jù)句意可知，該句陳述的是客觀事實(shí)，應(yīng)用一般現(xiàn)在時態(tài)，故先排除C和D。這句話的主語是Doing exercise every day，是一個動名詞短語，謂語動詞應(yīng)用單數(shù)。故選B。

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