From a distance you——- a wolf from a dog since wolves look very much like some dogs, such as German shepherds.
A. Couldn’t have been distinguished
B. Might not be able to distinguish
C. Would not be distinguished
D. Had better not distinguish
E. Shouldn’t have distinguished

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Past Simple & Past ContinuousJobsHave toLinkers and ConjunctionsModal, Causative Verb & Elliptical StructureSimple Present and Present Continuous TenseGrammar - Collective NounsPerfect TensesNouns FormationSuperlative & Comparative AdverbsOther quiz:
Perfect Tenses › ViewTurn into passive
Some students study grammar on the Internet.
A. On the Internet is studied grammar by some students
B. students was studied grammar on the Internet
C. grammar is studied on the Internet by some students
Grammar › View
Lots of ads _____ that their products produce great results.
A. focus
B. claim
C. mark
D. hire
She has …… the letter to her uncle in Spain
A. sends
B. to send
C. send
Grammar › View
When do we use simple present tense?
A. When an action has happened.
B. When an action is happening right now.
C. When an action may happen in the future.