[ TOEFL ]
Nimbostratus clouds are thick, dark grey clouds __________ forebode rain.
A. what
B. which
C. what they
D. which they

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Modal Verb Gerund or To InfinitiveGrammar (either..or.. and neither..nor..)Object PronounsDirect and Indirect QuestionConstrative ConjunctionAdjectives & Preposition“Put” Phrasal VerbPreference & Future TenseModals of PredictionNounsOther quiz:
Some vs. Any › ViewMy car stopped because there was …… petrol left
… a.some
… b.none
… c.any
Adjective › View
I am ….. about the tennis tournament tomorrow.
a.excited
b.exciting
Grammar › ViewA ___________checks out books
A. vet
B. teacher
C. librarian
D. none
Present Perfect › View
Have you ever ____ off your bike?
A. Fallen
B. Fell
C. Fall
