[ Modal Verb ]
A: How did the robbers get in?
B: We don’t know yet. The old woman …….. to lock the door.
A. might forget
B. could forget
C. might have forgotten
D. must have forgotten

Random Topics:
Employment VocabularyVocab and GrammarTenses & PassivePresent, Past, and Future TimeSimple Present - Negative & InterrogativePast Simple TensesParallel Structure or Combining SentencesAdverb of MannersComplex Sentencesduring, for, whileOther quiz:
Grammar › ViewRussia is _________ country in the world.
A. big
B. the biggest
C. the bigest
D. the bigger
Grammar › View
_______ friend was talking with them.
A. Their
B. There