If you really have to leave during class, you’d better leave____ the back door.

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should have left　 must have left should leave　　　 must leave

mustn’t leave shouldn’t have left couldn’t have left needn’t leave

for by across out

mustn’t leave shouldn’t have left couldn’t have left needn’t leave

mustn’t leave couldn’t have left needn’t leave shouldn’t have left

mustn't leave Shouldn't have left Couldn't have left needn't leave

mustn’t leave shouldn’t have left couldn’t have left needn’t leave

for by across out

should go must have gone should leave should have left

for by across out

for by across out

mustn’t leave shouldn’t have left couldn’t have left needn’ t leave

have had to do so must

mustn’t leave shouldn’t have left couldn’t have left needn’t leave

should have left must have left should leave must leave

mustn’t leave shouldn’t have left couldn’t have left needn’t leave

mustn’t leave shouldn’t have left couldn’t have left needn’t leave

mustn't leave shouldn't have left couldn't have left needn' t leave

can’t have should must