過去完成進行時結(jié)構(gòu):had been doing
例:The old clock had been being taken apart of and fixed up again for several times by my 10-year old son before I came back home.(我回到家之前,我10歲大的兒子已經(jīng)把這個舊鐘表拆卸并重新組裝了好幾回了。)(此處強調(diào)“拆卸”和“組裝”這兩個過去的過去的動作一直在反復進行。)(被動語態(tài))
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