Experts are trying to work out a plan to deal with the problems caused by global warming _________ it is too late.
| A．if | B．before | C．when | D．until |
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You _______ have washed the dishes. I would’ve put them in the dishwasher.
| A．shouldn’t | B．wouldn’t | C．couldn’t | D．needn’t |
After the summer camp, I realized I wanted to take a route _______
_ I could use English all the time.
| A．that | B．which | C．/ | D．where |
— ________ he ________ anything about this historic site?
— Yes. That’s why he suddenly becomes so obsessed with it.
| A．Has; read | B．Does; read | C．Did; read | D．Had; read |
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