20.—Did Linda see the traffic accident? —No,no sooner________than it happened. A.had she gone
B.she had gone C.has she gone
D.she has gone 【答案】 A ...and the machine that measures heart beats must also have broken since it gave readings of over two hundred beats per minute when I was cycling at full speed!……记录心跳的机器肯定坏了,因为当我全速骑车前进时,它给出了每分钟200多次的心跳!
since在此处为连词,意为“因为,既然,由于”,引导原因状语从句,与because,as同意,语气较弱。 Since you have known it,I needn’t tell you about it. 既然你已经知道了,我就不必告诉你了。 Since you are unable to answer,perhaps we should ask someone else.既然你不能回答,我们就应该问别人了。
since还可与现在完成时连用,意为“自……以来”。注意since可以用于It is/has been+时间+since+一般过去时态。若since后动词用瞬间性动词,表示“做某事多长时间了”;若since后动词为延续性动词,则表示“不做某事多长时间了”。 It is five years since he became a worker.他当工人5年了。 It is five years since he worked there. 他不在那儿工作5年了。
21.That was really a splendid evening.It’s years________I enjoyed myself so much. A.when
B.that C.before
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