你可能感兴趣的试题
knew have known had known know
had been; have met have been; have met had been; had met have been; had met
had been； have met have been； have met had been； had met have been； had met
knew have known had known know
had been； have met have been； have met had been； had met have been； had met
had been； have met have been； have met
had been； had met have been； had met
finally first then second
met; do met; did had met; did have met; do
have met; sang met; sang met; were singing have met; have sung
knew have known had known know
had waited have waited were waiting waited
knew have known had known know
had been; have met have been; have met had been; had met have been; had met
can we; on which we can; when can we; which we can; what
have met;sang met;sang met;were singing have met;have sung
knew have known had known know
knew have known have known know
for the first time the first time at the first time in the first time
knew have known had known know
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