20．-If the traffic hadn't been so heavy，I could have been back by 6o'clock．
-What a pity!Tina ________ here to see you．（　　）
A．isB．wasC．would beD．has been

分析 --如果交通沒(méi)那么擁擠，我本可以在6點(diǎn)前回來(lái)．
--真可惜！Tina到這里看你．

解答 答案：B 考查一般過(guò)去時(shí)．由句意知，Tina現(xiàn)在已走，剛才在這里等你，因此用一般過(guò)去時(shí)．故選B．A項(xiàng)：一般現(xiàn)在時(shí)；C項(xiàng)：過(guò)去將來(lái)時(shí)；D項(xiàng)：現(xiàn)在完成時(shí)．

點(diǎn)評(píng) 解答此類問(wèn)題要了解各種時(shí)態(tài)的用法，然后根據(jù)上下文及結(jié)合語(yǔ)境給出正確答案．

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