Were it not for friction, we ( ) walk on this earth of ours.
A: should not have been able to
B: would not be able to
C: were not able to
D: are not able to
A: should not have been able to
B: would not be able to
C: were not able to
D: are not able to
A
举一反三
- Were it not for friction (摩擦力), we ______walk on this earth of ours. ( ). A: were not able to B: should not have been able to C: would not be able to D: are not able to
- I wish I ________ to talk this over with him when he was here last night. A: had been able B: have been able C: were able D: should be able
- But for friction, people _________ neither walk, nor even stand up. A: can B: were able C: will be able D: could
- Without gravity, we ____ able to walk A: were B: should be C: can be D: should not be
- ________ the robots were able to have hands like ours, we would still need to design a way to control them.
内容
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They ______play the piano when they were young.(could/be able to) A: could B: were able to C: was able to D: could/were able to
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What a pity! If only they ______ here now, we would be able to celebrate their wedding anniversary. A: are B: were C: have been D: had been
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______ for your help, we' d never have been able to get over the difficulties. A: If we had not been B: Were it not C: If it were not D: Had it not been
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I would have been able to help him, but I so busy. A: were B: had been C: was D: would be
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_____ the robots were able to have hands like ours, we would still need to design a way to control them. A: Even if B: As if C: Just because D: Now that