【題目】—So are you saying that some scientists don’t believe in the greenhouse effect?

—No，I wouldn’t go that far.In fact，without the greenhouse effect the planet frozen.

A. has been B. would be

C. will be D. would have been

【答案】B

【解析】從答句中的“without the greenhouse effect”可知，此處是含蓄條件句，表示對(duì)現(xiàn)在事實(shí)的虛擬，所以選B。

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