[ Tenses ]
Chinese merchants ____ trade in Tibet since 1950, when China ____ the country.
A. dominate / was invading
B. dominated / invaded
C. were dominating / has invaded
D. have dominated / invaded

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Prefixes SuffixesVerbs, Tenses, and VocabularyPresent simple & ContinuousComparison DegreeSimple Past vs Past Continuous TenseInfinitivesFirst & Second ConditionalPast, Present, FuturePresent Simple ProgressiveLinkers and ConjunctionsOther quiz:
Grammar › ViewThe nib, or point, on a quill pen got flat quickly and had to be sharpened over and over, which meant quill pens didn’t last long, but it wasn’t until 1884 that a man named Lewis Waterman invented a fountain pen with a steel nib so that could be used a long time. Run-on sentence or rambling sentence?
A. run-on
B. rambling
Grammar › View
The correct sentence in the present simple tense is
A. The family plays basketball.
B. The family play basketball.