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 --如果交通沒那么擁擠，我本可以在6點前回來．
--真可惜！Tina到這里看你．

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

點評 解答此類問題要了解各種時態(tài)的用法，然后根據(jù)上下文及結合語境給出正確答案．

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